Key to males of Palaearctic species of Pachymeria

Note. The male is unknown for E. specularis Bezzi described from Egypt or Syria and placed provisionally to Pachymeria (Bezzi 1909). We suggest a subdivision of Pachymeria into two species groups (namely, E. femorata group and E. tumida group) as defined below.

1 Hind leg with geniculate tibia (Chvála 1994: 31, fig. 23). Male terminalia with epandrial lamellae very large, boat-shaped, evenly rounded posteriorly, entirely shielding very long filamentous phallus (E. femorata group)....................... 2

- Hind leg with simple tibia (Fig. 1). Male terminalia with epandrial lamellae small, dolabriform (Figs 1, 3); phallus free on basal part between posterior margin of sternite 8 and lower margin of epandrial lamella (E. tumida group)............... 5

2 Mesonotum with only black setae; laterotergite usually with black setae (variable in E. femorata)...................... 3

- Mesonotum with acrostichals and dorsocentrals pale at least anteriorly, numerous pale hair-like setae on notopleuron; laterotergite with mostly pale setae (sometimes additional dark setae present)........................................ 4

3 Palpus yellow. Fore and mid legs only with femora blackish brown on about basal 2/3, otherwise yellowish to brownish yellow................................................................................ E. (P.) femorata Fabricius

- Palpus black. Fore and mid legs uniformly blackish brown................................. E. (P.) ptilocnemis (Loew)

4 Frons moderately broad below ocellar triangle, nearly as broad as distance between inner margins of posterior ocelli. Antennae with pedicel blackish............................................................. E. (P.) mediterranea (Loew)

- Frons very narrow below ocellar triangle, at most as broad as anterior ocellus. Antennae with pedicel yellowish............................................................................................ E. (P.) subclavata (Loew)

5 Frons below ocellar triangle very narrow, usually narrower than anterior ocellus, eyes often almost touching............. 6

- Frons below ocellar triangle broader, at least twice as broad as anterior ocellus..................................... 7

6 Abdominal sternites shiny........................................................... E. (P.) obscuripes (Loew)

- Abdominal sternites densely greyish pollinose............................................. E. (P.) contigua (Loew)

7 Palpus black to blackish brown, very long, projecting far beyond mouth-cavity, covered with numerous blackish setae.......................................................................................... E. (P.) scotica Curtis

- Palpus yellow to pale yellow, at most darkened on apex, short, covered with scattered setulae......................... 8

8 Halter with brown knob................................................................ E. (P.) tumida Meigen

- Halter entirely yellow.................................................................................. 9

9 Abdomen almost entirely shiny, only tergite 1 and sternites 1–2 greyish pollinose................ E. (P.) ringdahli (Collin)

- Abdomen extensively pollinose, at least all sternites entirely densely pollinose.................................... 10

10 Prosternum pale setose. Abdominal tergites covered with golden yellow hair-like setae (besides black posteromarginal setae)................................................................................ E. (P.) roditakisi Shamshev

- Prosternum and abdomen only with black setae............................................................. 11

11 Scutum with 4 brownish vittae (dorsal view) between rows of acrostichal, dorsocentral and supra-alar setae. Abdominal tergites very pale greyish on posterior margin................................................... E. (P.) picena Bezzi

- Scutum with 3 subshiny to shiny blackish vittae running beneath rows of acrostichal and dorsocentral setae (dorsal view), sometimes, with additional spots on supra-alar space. Abdominal tergites uniformly greyish, sometimes, with shiny spots....................................................................................................... 12

12 Antennal postpedicel largely reddish yellow. Scutum with 3 subshiny blackish vittae running beneath rows of acrostichal and dorsocentral setae (dorsal view)........................................................ E. (P.) vikhrevi sp. nov.

- Antennal postpedicel black. Scutum with 3 subshiny to shiny blackish vittae running beneath rows of acrostichal and dorsocentral setae (dorsal view) and with 2 similar spots on supra-alar space on each side.................................................................................................. E. (P.) trianguligera Strobl (= E. suberis Becker)