Tachydromiinae (Moulton & Wiegmann, 2007)

Grootaert, Patrick & Shamshev, Igor V., 2012, The fast-running flies (Diptera, Hybotidae, Tachydromiinae) of Singapore and adjacent regions, European Journal of Taxonomy 5, pp. 1-162 : 13-14

Key to the genera of Tachydromiinae from the Oriental Region

1. Postpronotal lobe differentiated ( Fig. 5 ). Eyes bare. Scutum usually distinctly longer than broad.......2

– Postpronotal lobe undifferentiated. Eyes with tiny ommatrichia. Scutum not or scarcely longer than broad.................................................................................................................................................4

2. Vein A 1 present ( Fig. 10 ), even if sometimes faint. Mid femur thickened and armed with rows of spinelike setae ventrally ….........................................................…………….. Platypalpus Macquart, 1827

–Vein A 1 absent. Mid femur more or less slender and usually with weak setae ventrally…………………3

3. Vein CuA 2 present........................................................................................... Tachypeza Meigen, 1830

– Vein CuA 2 absent........................................................................................ Tachydromia Meigen, 1803

4. Cells br and bm subequal in length at apex ( Figs 12-13, 18 ; if in doubt, then eyes widely separated on face and hind tibia bristly)...........……................................................…………………………….5

– Cell br much shorter than cell bm at apex…..............................…………………………………….7

5. Scutellum with 3-4 pairs of bristles. Vein A 1 present…........................ Megagrapha Melander, 1928

– Scutellum with 1-2 pairs of bristles. Vein A 1 absent…….................................………………………6

6. Legs with hind tibia bristly. Eyes usually widely separated on face and frons …………..……………… ……………..................................................................……………….... Chersodromia Walker, 1849

– Legs with hind tibia lacking bristles. Eyes contiguous on face and widely separated on frons …..… ………………………….........................................…………..………. Nanodromia Grootaert, 1994

7. Antenna with arista-like stylus dorsoapical ( Fig. 26 ; postpedicel with dorsoapical extension). Abdominal tergites without squamiform setae, tergites 3-5 usually of subequal width......................8

– Antenna with arista-like stylus apical or subapical (postpedicel without dorsoapical extension). Some abdominal tergites often with squamiform setae laterally; if squamiform setae absent, then gena distinctly developed below eye or tergite 4 enlarged...................................................................9

8. Scutum with subequally short dorsocentrals. Rs originating at most halfway along R 1, longer than crossvein bm-cu..................................................................................................... Stilpon Loew, 1859

– Scutum with pair of long presutural dorsocentrals. Rs originating far beyond halfway along R 1, nearly as long as crossvein bm-cu……............................................... Pontodromia Grootaert, 1994

9. Gena distinctly developed below eye. Pedicel usually with very long ventral seta. Rs usually shorter than crossvein bm-cu………………............................................. Crossopalpus Bigot, 1857

– Gena scarcely extended below eye. Pedicel usually with circlet of subequally short setae. Rs usually longer, at least as long as crossvein bm-cu……….....................................……………..10

10. Occiput convex. Postpedicel conical to lanceolate. Hind tibia usually with long anterodorsal bristles. Body often with yellowish markings........................................ Elaphropeza Macquart, 1827

– Occiput somewhat flattened (head closely set upon thorax). Postpedicel oval. Hind tibia without long anterodorsal bristles. Body dark brown to black…........................……………...11

11. Abdominal tergites with squamiform setae………................................……. Drapetis Meigen, 1822

– Abdominal tergites without squamiform setae...... Sinodrapetis Yang, Gaimari & Grootaert, 2004

Figures

Figs 3-6. Elaphropeza biuncinata (Melander, 1928). 3. head, ♂, lateral view. 4. head, ♂, frontal view. 5. Platypalpus sp. scutum dorsal view. 6. E. biuncinata thorax, lateral view.

Figs 10-18. Wings of Tachydromiinae. 10. Platypalpus singaporensis sp. nov. 11. Tachydromia luang Shamshev & Grootaert, 2005. 12. Chersodromia sylvicola sp. nov. 13. Chersodromia glandula sp. nov. 14. Drapetis laut sp. nov. 15. Elaphropeza biuncinata (Melander, 1928). 16. Crossopalpus temasek sp. nov. 17. Stilpon laawae Shamshev & Grootaert, 2004. 18. Nanodromia narmjeud Grootaert & Shamshev, 2003.

Figs 19-26. Antennae of Tachydromiinae. 19. Platypalpus singaporensis sp. nov. 20. Platypalpus hualuang Grootaert & Shamshev, 2006. 21. Tachydromia luang Shamshev & Grootaert, 2005. 22. Drapetis mandai sp. nov. 23. Drapetis hutan sp. nov. 24. Chersodromia singaporensis Shamshev & Grootaert, 2005. 25. Crossopalpus temasek sp. nov. 26. Stilpon singaporensis sp. nov.