Spilogona Sorokina, 2018, sp. nov.

Key to the Altai species of Spilogona

The keу tо mаles inсludes аll the 53 sрeсies оf Spilogona knоwn frоm the Altаin Mts, while the keу tо femаles inсludes 48 sрeсies. Femаles оf Spilogona altaica sp. nov., S. colorata sp. nov., S. insolita sp. nov., S. orthosurstyla Xue & Tiаn, аnd S. tanushka sp. nov. аre nоt knоwn.

MALЕS

1 Thorax with 4 pairs of post dc setae....................................................................... 2

- Thorax with 3 pairs of post dc setae...................................................................... 50

2 Frons as wide as distance between first pair of dc setae or wider, with two orbital setae; sternite 5 very large and protuberant,

longer than length of sternites 1–4 (Fig. 8A)..................................................... insolita sp. nov. - Width of frons at most as wide as half distance between first pair of dc setae, orbital setae absent; sternite 5 normal, not protu- berant and not longer than length of sternites 1–4............................................................ 3

3 Facial edge projecting beyond level of profrons.............................................................. 4

- Facial edge not projecting beyond level of profrons.......................................................... 15

4 Parafacial very broad, at least twice as wide as postpedicel; fronto-orbital plates broadly separated by frontal vitta; proboscis very long and thin..................................................................................... 5

- Parafacial narrower; fronto-orbital plates touching or separated by a narrow frontal vitta; proboscis short, thick or thin..... 6

5 Scutum blue-grey dusted with brown marks and stripes; notopleuron bare; mid tibia without pv and v setae; abdomen yellow- ish-brown dusted. Smaller size: 5.8 mm..................................................... longissima sp. nov.

- Scutum blue-grey dusted without distinct marks and stripes; notopleuron haired around second notopleural seta; mid tibia with pv and v setae; abdomen bluish or greenish-grey dusted. Larger size: 9 mm.......................... tendipes (Malloch)

6 Notopleuron haired, at least with some hairs around second notopleural seta....................................... 7

- Notopleuron bare apart from the setae.................................................................... 10

7 Halter brownish-black; mid tibia without v seta.............................................................. 8

- Halter yellow; mid tibia with v seta....................................................................... 9

8 Proboscis with shining prementum; scutum with 3 brown longitudinal stripes which reach scutellum, and with brown marks between intra- and supra-alar setae (Fig. 11B); hind femur without distinct elongate pv setae........................................................................................................ novgorodovana sp. nov. (part)

- Proboscis with dusted prementum; scutum completely black; hind femur with long pv setae....... triangulifera (Zetterstedt)

9 Proboscis with shining prementum; hind femur without distinct pv setae; abdomen blackish without distinct marks.......................................................................................... quinquesetosa (Schnabl)

- Prementum of proboscis with weak dust; hind femur with several distinct pv setae; abdomen mostly greyish with distinct black spots....................................................................... sordidipennis (Holmgren) (part)

10 Anepisternum with 2–3 interspatial setae; hind femur with a row of elongate pv setae............................... 11

- Anepisternum without interspatial seta; hind femur without a row of elongate pv setae, at most with several short or hair-like pv setae............................................................................................ 12

11 Sternite 1 haired; halter dark brown, mostly blackish; mid tibia with 1–3 pv and with 1–2 short v setae. Smaller size: 5.0–6.0 mm................................................................................... antoninae sp. nov.

- Sternite 1 bare; halter yellowish-brown, paler; mid tibia without or with 1–2 short pv setae. Larger size: 6.5–7.5 mm........................................................................................... almqvistii (Holmgren)

12 Mid tibia with distinct v seta.............................................................. pseudodispar (Frey)

- Mid tibia without v seta................................................................................ 13

13 Halter completely yellow or with darkened knob; inner edge of sternite 5 with numerous spinose setae (Fig. 22E); hind femur with longer pv setae, as long or longer than diameter of femur................................... setulosa (Ringdahl)

- Halter brown or blackish; inner edge of sternite 5 with normal setae, without spinose setae; hind femur without distinct pv setae, but if pv present then not longer than diameter of femur................................................. 14

14 Fronto-orbital plates touching (Fig. 11B); tergites 3 and 4 with large trapezoidal marks; gena densely setose and with a group of upcurved setae on anterior part of genal dilation (Fig. 11A); hind femur without distinct pv setae. Montane species.................................................................................... novgorodovana sp. nov. (part)

- Fronto-orbital plates separated by a narrow frontal vitta; gena without a group of upcurved setae on anterior part of genal dila- tion; tergites 3 and 4 with triangular marks; hind femur with short, but distinct pv setae. Arctic species....................................................................................................... sanctipauli (Malloch)

15 Mid femur with a single strong seta or spine near base of ventral surface, pv setae always absent...................... 16

- Mid femur without a strong spine near base of ventral surface, with a row of fine or strong pv setae, or pv absent......... 18

16 Mid tibia with short but distinct pv seta; scutum black; parafacial narrow, as wide as 0.5–0.7 times width of postpedicel; calypters and wing-base deep yellow; mid femur with one short strong seta in basal fourth and with a very short seta at base of ventral surface............................................................................. flavinervis Huckett

- Mid tibia without any v setae; scutum grey; parafacial broader, as wide as width of postpedicel; calypters and wing-base light yellow; mid femur just with one strong seta at base of ventral surface........................................... 17

17 Scutum when viewed from in front mostly pale grey on discal surface of postsutural region; scutellum with a pale grey spot in middle................................................................................. monacantha (Collin)

- Scutum when viewed from in front largely fuscous on discal surface of postsutural region; scutellum dark brown................................................................................................. semiglobosa (Ringdahl)

18 Notopleuron haired, at least with some hairs around second notopleural seta...................................... 19

- Notopleuron bare around second notopleural seta........................................................... 28

19 Scutellum with downwardly-directed preapical setulae on upper border of declivities............................... 20

- Scutellum without downwardly-directed preapical setulae on upper border of declivities............................ 21

20 Mid tibia with v seta; abdomen densely whitish-grey dusted except for 2 quadrate black marks on tergite 3........................................................................................................... nutaka Huckett

- Mid tibia without v seta; abdomen brownish-grey dusted with quadrate black marks on tergite 3 and triangular marks on tergite 4............................................................................... deflorata (Holmgren) (part)

21 Anepisternum with 1–3 interspatial setae................................................ imitatrix (Malloch) (part)

- Anepisternum without interspatial seta.................................................................... 22

22 Sternite 1 with hairs..................................................................... opaca (Schnabl) (part)

- Sternite 1 bare....................................................................................... 23

23 Abdomen entirely deep brown, without distinct dorsal marks; prementum shining.................................... 24

- Abdomen pale or dark grey, but with more or less distinct dark dorsal marks; prementum with dust..................... 25

24 Halter blackish-brown; Katepisternal setae 1+2. Small size: 3.4–4.5 mm.............................. khrulevae Sorokina

- Halter yellow; Katepisternal setae 1+1. Larger size: 5.0– 6.5 mm................................ quinquesetosa (Schnabl)

25 Abdomen dark grey dusted, with large black marks that are narrowly separated................ depressiuscula ( Zetterstedt)

- Abdomen whitish-grey dusted with distinct black marks that are widely separated.................................... 26

26 Fore tibia with 2 median p setae; mid tibia with v and pv setae; facial edge a little projecting beyond level of profrons................................................................................... sordidipennis (Holmgren) (part)

- Fore tibia without median p setae; mid tibia without pv and v setae, or sometimes with a very short v seta; facial edge not pro- jecting beyond level of profrons......................................................................... 27

27 Hind femur with a row of elongate pv setae, as long as diameter of femur; hind tibia without pd setae. Smaller size: 4.5–5.5 mm.................................................................................. sjostedti (Ringdahl)

- Hind femur without a row elongate pv setae, but if pv present then they are not longer than diameter of femur; hind tibia with 1–2 short pd setae. Larger size: 6.0– 6.8 mm........................................................ tara sp. nov.

28 Sternite 1 haired...................................................................................... 29

- Sternite 1 bare, or only with individual hairs............................................................... 31

29 Epandrium very large, swollen; abdomen plump; tergites with a more or less distinct median stripe between the dark marks..................................................................................... trigonata (Zetterstedt)

- Epandrium normal, not swollen; abdomen dorsoventrally flattened; tergites without a distinct median stripe between the dark marks.............................................................................................. 30

30 Prementum shining; mid tibia with 1 or 2 ad setae; parafacial a little wider than width of postpedicel. Larger size: 8–8.5 mm............................................................................................ setigera (Stein)

- Prementum dusted; mid tibia without ad setae; parafacial narrower than width of postpedicel. Small size: 5–6.5 mm........................................................................................... opaca (Schnabl) (part)

31 Scutellum with downwardly-directed preapical setulae on upper border of declivities............................... 32

- Scutellum without downwardly-directed preapical setulae on upper border of declivities............................ 37

32 Prementum dusted.................................................................................... 33

- Prementum mostly shining............................................................................. 35

33 Halter blackish-brown; abdomen dark brown dusted, with large black marks so that it appears completely black; arista dis- tinctly pubescent; hind femur with long pv, as long as or longer than diameter of femur................ obscuripennis Stein

- Halter yellow or with light darkened knob; abdomen light grey dusted with black contrasting marks; arista almost bare; hind femur without pv setae, but if pv are present then they are shorter than diameter of femur............................ 34

34 Scutum and pleura whitish-grey dusted, scutum with 3 brown stripes; abdomen with triangular dark marks on tergites 3 and 4; anepisternum without interspatial setae..................................................... arenosa (Ringdahl)

- Scutum and pleura deep brown dusted, without distinct stripes; abdomen with large square dark marks on tergite 3 and with small triangular or rounded marks on tergite 4; anepisternum usually with 1–2 interspatial seta... deflorata (Holmgren) (part)

35 Scutum seen from in front with anterior border of presutural region greyish; sternite 5 with a blunt, rounded, caudal margin (Fig. 22B, 22G)......................................................................... humeralis Huckett

- Scutum completely deep brown dusted; sternite 5 with an extended and slightly pointed caudal margin (Fig. 22H)........ 3 6

36 Abdomen with big square marks on tergite 3 and with small triangular or rounded marks on tergite 4; anepisternum usually with 1–2 interspatial setae; caudal margin of sternite 5 with shining apex..................... deflorata (Holmgren) (part)

- Abdomen with triangular or trapezoidal marks on tergites 3 and 4; anepisternum without interspatial setae; caudal margin of sternite 5 with dusted apex (Fig. 22H).................................................... albisquama (Ringdahl)

37 Anepisternum with 1–3 interspatial setae.................................................................. 38

- Anepisternum without interspatial setae................................................................... 43

38 Mid femur with a row of regular (not stout and not spine-like) pv–v setae........................................ 39

- Mid femur at least with 1–2 stout and spine-like pv–v setae on basal half and with short regular pv on apical half......... 40

39 Hind femur with short but distinct pv setae; fronto-orbital plates separated by a wide frontal vitta that is as wide as the distance between posterior ocelli; prementum shining; parafacial as wide as width of postpedicel................ meadei (Schnabl)

- Hind femur without pv setae; fronto-orbital plates touching or separated by a frontal vitta that is narrower than the distance between posterior ocelli; prementum subshining, with a patch of dust centrally on underside; parafacial distinctly wider than width of postpedicel.................................................................... bomynensis Hennig

40 Scutum with 3 more or less distinct wide brown longitudinal stripes which are sometimes connected; scutellum brown on basal half and grey on apical half; abdomen conical, yellow-brown dusted, syntergite 1+2 light with two black marks, tergites 3 and 4 with small trapezoidal or triangular marks separated by a broad mid-line......................... stackelbergi Hennig

- Scutum dark, greyish-brown dusted without distinct longitudinal stripes; scutellum completely dark; abdomen oval, grey dusted, syntergite 1+2 completely black, tergites 3 and 4 with large square or trapezoidal marks that are connected or narrowly separated........................................................................................... 41

41 Fronto-orbital plates touching along greater part of length, narrower than diameter of anterior ocellus (Fig. 13B); distance between eye margins at upper part of frons about as wide as diameter of anterior ocellus; prementum shining but with a patch of light dust centrally on underside; presutural region of scutum mostly with whitish-grey dust; mid femur with 5–6 long and stout pv–v setae on basal half; hind femur with 5–6 av setae at apex................................ platyfrons sp. nov.

- Fronto-orbital plates touching only on upper part or separated by a narrow frontal vitta; distance between eye margins at upper part of frons as wide as or narrower than the distance between posterior ocelli; prementum completely shining, without any dust; extreme anterior half of presutural region of scutum with grey dust; mid femur with 2–4 stout pv–v setae on basal half; hind femur with 3–4 av setae at apex..................................................................... 42

42 Notopleuron with some hairs on upper part, but not around the posterior seta; fronto-orbital plates touching in upper part or separated with a very narrow frontal vitta; mid tibia without ad and v setae; tergite 3 usually with marks connected or narrowly separated; caudal margin of sternite 5 with dense setulae.................................... imitatrix (Malloch) (part)

- Notopleuron without hairs; fronto-orbital plates usually separated by a distinct frontal vitta, sometimes touching; mid tibia with 1 ad and sometimes a short v seta; tergites with well separated marks; caudal margin of sternite 5 without dense setulae.................................................................................... nitidicauda (Schnabl)

43 Scutum whitish or bluish-grey, without or with more or less distinct brown stripes or marks.......................... 44

- Scutum blackish or dark brown, without distinct stripes or marks............................................... 46

44 Halter black; fronto-orbital plates separated by a narrow frontal vitta; marks on tergites expansive and extended ventrad............................................................................................... micans Ringdahl

- Halter yellow; frons narrow, fronto-orbital plates touching; marks on tergites restricted and confined to dorsum.......... 45

45 Scutum with 3 narrow longitudinal stripes or with trace of these stripes; mid femur without v–pv setae; hind femur with elongate hair-like v–pv setae restricted to base; prementum shining..................................... placida (Huckett)

- Scutum with 2 distinct brown stripes along dc setae and a brown spot between them in the middle of postsutural region (Fig. 4B); mid femur with a row of long pv setae; hind femur with a row of long pv setae on basal third; prementum with thin dust....................................................................................... colorata sp. nov.

46 Hind femur with a row of elongate pv setae as long as diameter of femur; prementum at least with thin dust............. 47

- Hind femur without elongate pv setae, but if pv are present then they are not longer than diameter of femur; prementum mostly shining............................................................................................. 48

47 Fronto-orbital plates separated by a frontal vitta; subcostal vein with a few ventral fine hairs basad of the humeral cross-vein; tergite 3 with large trapezoidal marks; parafacial wide, at middle as wide as postpedicel or wider....................................................................................................... trianguligera (Zetterstedt)

- Fronto-orbital plates touching (Fig. 1B); subcostal vein bare, without hairs basad of the humeral cross-vein; tergite 3 with small triangular marks; parafacial narrow, at middle as wide as 0.5 times width of postpedicel (Fig. 1A).......................................................................................................... altaica sp. nov.

48 Scutum with a whitish-grey spot in front of scutellum; abdomen short and plump; parafacial narrower than width of postpedicel; mid tibia usually without ad seta........................................................ pacifica (Meigen)

- Scutum without a whitish-grey spot in front of scutellum; abdomen conical; parafacial as wide as width of postpedicel; mid tibia usually with ad seta............................................................................... 49

49 Mid and hind femora with numerous hair-like av–v setae on basal half about as long as diameter of femur or shorter; width of parafacial at level of base of antenna 0.5–0.7 times width of postpedicel, hardly narrowing below; sternite 5 with reddish caudal margin (Fig. 6D)..................................................................... improvisa sp. nov.

- Mid and hind femora without such setae; parafacial at level of base of antenna as wide as width of postpedicel, visibly narrowing below; sternite 5 not as above.......................................................... sororcula (Zetterstedt)

50 Frons as wide as half the distance between first pair of dc setae or wider......................................... 51

- Width of frons less than half distance between first pair of dc setae............................................. 56

51 Frons at level of anterior ocellus about as wide as distance between first pair of dc setae............................. 52

- Frons at level of anterior ocellus about as wide as half distance between first pair of dc setae......................... 54

52 Small (3.0– 3.5 mm) species with shiny frontal triangle and black halter; mid femur with 1–2 hair-like setae on basal third; costa with a series of elongate and strong setulae on proximal part................................... spinicosta (Stein)

- Larger (5.0– 5.8 mm) grey species; frontal triangle dusted; halter yellow; mid femur with one stout spinose seta at base; costa with short strong setulae on proximal part................................................................. 53

53 Abdomen with distinct brown marks; prementum dusted; wing without costal spine; postpedicel long, 2/3 as long as eye height........................................................................................ incerta Huckett

- Abdomen without marks (Fig. 5A); prementum shining; wing with costal spines; postpedicel short, 1/2–1/3 as long as eye height................................................................................ decolorata sp. nov.

54 Facial edge projecting beyond level of profrons; halter blackish; anepisternum with 1 interspatial setae. Smaller size: 3–4 mm..................................................................................... alpica ( Zetterstedt)

- Facial edge not projecting beyond level of profrons; halter yellow; anepisternum without interspatial setae. Larger size: 5–7 mm................................................................................................ 55

55 Hind femur with a row of long pv setae; arista pubescent, with longest individual hairs as long as basal diameter of arista; scutellum with downwardly-directed preapical setulae on upper border of declivities................... surda (Zetterstedt)

- Hind femur without pv setae; arista short plumose, with longest individual hairs 1/3–1/2 as long as width of postpedicel; scutellum without downwardly-directed preapical setulae on upper border of declivities.......................... falleni Pont

56 Prementum dusted; scutellum with downwardly-directed preapical setulae on upper border of declivities............... 57

- Prementum mostly shining; scutellum without downwardly-directed preapical setulae on upper border of declivities...... 58

57 Halter blackish-brown; abdomen dark, with indistinct marks on tergites 3 and 4......................... costalis (Stein)

- Halter yellow; abdomen grey or brownish, with distinct marks on tergites 3 and 4................. depressula (Zetterstedt)

58 Mid tibia with pv–v setae; hind femur without pv setae; abdomen black, without marks; halter blackish-brown.................................................................................................. khrulevae Sorokina

- Mid tibia without pv–v setae; hind femur with elongate pv setae; abdomen grey or brown dusted, with distinct marks; halter yellow or brownish................................................................................... 59

59 Abdomen dorsoventrally flattened, brown dusted, with trapezoidal marks on tergites 3 and 4; facial edge slightly projecting beyond level of profrons (Fig. 16A); fore tibia without median p seta; halter reddish or yellowish-brown........................................................................................................ tanushka sp. nov.

- Abdomen not flattened, plump, usually grey dusted, with triangular marks on tergites 3 and 4; facial edge not projecting beyond level of profrons; fore tibia with median p seta; halter yellow............................................ 60

60 Scutum completely dark brown (Mountains populations) or light grey with indistinct stripes (Arctic tundra populations); sternite 5 with a narrow median notch (Fig. 19B), with a wavy inner edge; hypandrium with a protuberance in lateral view; surstylus sharply curved at middle (Fig. 19E)..................................................... arctica (Zetterstedt)

- Scutum grey or brownish dusted with more or less distinct dark stripes; sternite 5 with a rather wide median notch; hypandrium without a distinct protuberance; shape of surstylus not as above................................................ 61

61 Sternite 5 with a wide rectangular median notch, inner edge more or less straight (Fig. 19C); scutum with distinct dark stripes; surstylus short, gently curved, about as long as cerci (Fig. 19F)................................... alticola (Malloch)

- Sternite 5 not as above; scutum with indistinct dark stripes, often diffuse; surstylus longer than cerci...................62

62 Sternite 5 with an extended and pointed caudal margin (Fig. 22D); surstylus straight, curved only at apex (Fig. 20D, 21D)................................................................................... orthosurstyla Xue & Tian

- Sternite 5 with a rounded caudal margin (Fig. 19A); surstylus not straight, weakly curved at middle (Fig. 19D)........................................................................................... contractifrons (Zetterstedt)