Empis (Pachymeria)

Shamshev, Igor V. & Barták, Miroslav, 2019, New and little-known species of Empis (Diptera: Empididae) from Bulgaria, Israel and Turkey, with keys to the Palaearctic Pachymeria and the Mediterranean Xanthempis, Zootaxa 4555 (1), pp. 91-100 : 95

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 )

Figures

FIGURES 1–4. Empis (Pachymeria) vikhrevi sp. nov. 1. male habitus, holotype, lateral view; 2. female habitus, lateral view; 3. cleared preparation of male genitalia, lateral view; 4. outline of male terminalia (setation omitted), lateral view. Abbreviations: cerc—cercus; ej apod—ejaculatory apodeme; epand—epandrium; hypd—hypandrium; ph—phallus.