Rhamphomyia Meigen 1822

Key to female Rhamphomyia of the Canadian Arctic Islands, Greenland and Iceland

1 Prosternum clothed entirely with white to brownish silky hair-like setae (Fig. 3D)..... R. (Ctenempis) albopilosa Coquillett

- Prosternum bare...................................................................................... 2

2 Hind femur with pennate setae ventrally (Fig. 9B)........................................................... 3

- Hind femur without pennate setae ventrally................................................................. 6

3 Thorax with grey pruinescence, with brown colouration beneath rows of acrostichals and dorsocentral setae.................................................................................... R. (Pararhamphomyia) helleni Frey

- Thorax brown, without brown vittae...................................................................... 4

4 Robust species with darkly infuscate wings; acrostichals multiserial and scutum brown with pair of greyish vittae between acrostichals and dorsocentral setae................................... R. (Dasyrhamphomyia) hovgaardii Holmgren

- Slender species with lightly infuscate wings; acrostichals biserial; scutum shiny.................................... 5

5 Hind tibia with simple setae only (Fig. 51A)............................................... R. herschelli Malloch

- Hind tibia with pennate setae (Fig. 56A)..................................................... R. laevigata Loew

6 Wing with basal costal seta............................................................................. 7

- Wing without basal costal seta.......................................................................... 14

7 Halter yellowish to white............................................................................... 8

- Halter brownish..................................................................................... 10

8 Scutum black subshiny beneath rows of dorsocentral setae; abdominal tergites shiny laterally............................................................... R. (Eorhamphomyia) shewelli Sinclair, Vajda, Saigusa & Shamshev sp. nov.

- Scutum and abdominal tergites entirely pruinescent.......................................................... 9

9 Occiput with stout setae; dorsocentral setae multiserial; legs reddish, subshiny................ R. (P.) simplex Zetterstedt

- Occiput without stout setae; dorsocentral setae uniserial; legs pale brown, not shiny................................................................................. R. (P.) lymaniana Sinclair, Vajda, Saigusa & Shamshev sp. nov.

10 Scutellum with at most 3 pairs of marginal setae............................................................ 11

- Scutellum with more than 3 pairs of marginal setae......................................................... 12

11 Scutum dark brown; hind tibia with numerous anterodorsal and posterodorsal setae longer than width of tibia................................................................................................. R. setosa Coquillett

- Scutum dark, with greyish pruinescence; hind tibia with few dorsal setae, at most as long as width of tibia...................................................................................................... R. (P.) hoeli Frey

12 Thorax and, usually, legs with grey pruinescence............................................................................................................ R. (P.) petervajdai Sinclair, Vajda, Saigusa & Shamshev sp. nov.

- Thorax and legs brown, without grey pruinescence.......................................................... 13

13 Hind tarsomere 1 with several long dorsal setae longer than width of tarsomere; anal lobe of wing darker than wing tip....................................................................... R. (P.) filicauda Henriksen & Lundbeck

13 Hind tarsomere 1 without long dorsal setae; anal lobe of wing similar to wing tip.................. R. hirtula Zetterstedt

14 Wing with cell bm greatly elongated with apex almost reaching wing margin, cell dm open and vein M 2 reduced (sometimes some portion present near wing margin); scutal vittae dark and shiny (Fig. 62B).............. R. (P.) diversipennis Becker

- Wing with normal venation; scutal vittae, when present, pruinose.............................................. 15

15 Legs including coxae yellowish to yellowish-brown......................................................... 16

- Legs including coxae dark............................................................................. 17

16 Wing entirely darkly infuscate; scutum with brown vittae beneath rows of acrostichal and dorsocentral setae............................................................................................. R. (D.) leptidiformis Frey

- Wing with infuscation fading toward wing base (Fig. 62D); scutum uniformly greyish pruinose........................................................................................................ R. (P.) hilariformis Frey

17 Anepisternum shiny; scutum with 1–2 pairs of shiny vittae between rows of acrostichals and dorsocentral setae......................................................................................... R. (P.) ursinella Melander

- Anepisternum pruinose; scutum with or without shiny vittae.................................................. 18

18 Coxae with stout, stiff setae............................................................................ 19

- Coxae with thin setae................................................................................. 21

19 Wing darkly infuscate............................................................. R. (P.) omissinervis Becker

- Wing faintly infuscate................................................................................ 20

20 Hind tibia with ventral setae nearly subequal in length to width of tibia..................... R. (P.) kjellmanii Holmgren

- Hind tibia with ventral setae at most half-length of tibia width..................................................................................................... R. (P.) frigida Sinclair, Vajda, Saigusa & Shamshev sp. nov.

21 Scutum with pair of shiny vittae between rows of acrostichals and dorsocentral setae and broad shiny supra-alar vitta................................................... R. (P.) septentrionalis Sinclair, Vajda, Saigusa & Shamshev sp. nov.

- Scutum entirely pruinescent, with slightly prominent brownish vittae along rows of acrostichals and dorsocentral setae... 22

22 Smaller, about 5 mm; darker, scutum almost uniformly dark brown, legs robust; halter brown....................................................................................................... R. (D.) erinacioides Malloch

– Larger, 6–7 mm; more greyish, scutal vittae quite distinct, legs slender; halter pale yellow........ R. (D.) nigrita Zetterstedt