Platypalpus hackmani

Shamshev, Igor & Grootaert, Patrick, 2012, Proposed change in status of the Nearctic genus Charadrodromia Melander (Diptera: Hybotidae, Tachydromiinae), with description of four new species, Zootaxa 3525, pp. 35-50 : 48-49

Key to species of the Platypalpus hackmani group from North America

1 Katepisternum with large shining spot. Antenna with postpedicel about 2.5 times as long as wide..... P. arnaudi (Melander)

– Katepisternum entirely tomentose. Antenna with short postpedicel which is at most 1.5 times as long as wide........... 2

2 Dorsocentral bristles uniserial. Male: mid tibia with short, black, claw-like apical spur................ P. canus Melander

– Dorsocentral bristles at least anteriorly arranged in 2–3 (or more) irregular rows. Mid tibia without apical spur in both sexes... 3

3 Legs brown, only knees of fore pair somewhat paler........................................ P. syletor (Melander)

– Legs yellow, at most some tarsomeres brownish............................................................. 4

4 Antenna with scape and pedicel yellow, postpedicel brown. Palpus yellow. Male: right epandrial lamella cleft apically ( Fig. 18 )................................................................................ P. submicrophona sp. nov.

– Antenna brown. Palpus brown (except P. microphona ). Male: right epandrial lamella more or less rounded apically....... 5

5 Scutum almost uniformly covered with very short setulae, acrostichals and dorsocentrals undifferentiated. Halter with pale yel- low stem and darkened knob. Male: left epandrial lamella pointed apically, with scattered, moderately long, marginal setae ventrally ( Fig. 23 ).................................................................. P. tanbarkiensis sp. nov.

– Acrostichals separated from dorsocentrals by bare space. Halter uniformly pale yellow. Male: left epandrial lamella rounded apically, with numerous very long setae sitting fan-like on ventral tubercle (unknown in P. microphona )................ 6

6 Palpus yellow. Male unknown....................................................... P. microphona (Melander)

– Palpus brown........................................................................................ 7

7 Dorsocentrals arranged in 2–3 irregular rows. Fore tarsus yellow. Male: left epandrial lamella with finger-like projection apically ( Fig. 17 )....................................................................... P. layiaphilus sp. nov.

– Dorsocentrals more numerous, not arranged in regular rows and undifferentiated from supra-alar setulae. Fore tarsomeres 2–5 yellowish brown. Male: left epandrial lamella broadly rounded apically ( Fig. 14 ).................. P. cummingi sp. nov.

Figures

FIGURES 18 – 20. Platypalpus submicrophona sp. nov., male. 18. right epandrial lamella, lateral view. 19. cerci and epandrium, dorsal view. 20. left epandrial lamella and left cercus, lateral view.

FIGURES 21 – 23. Platypalpus tanbarkiensis sp. nov., male. 21. right epandrial lamella, lateral view. 22. cerci and epandrium, dorsal view. 23. left epandrial lamella and left cercus, lateral view.

FIGURES 15 – 17. Platypalpus layiaphilus sp. nov., male. 15. right epandrial lamella, lateral view. 16. cerci and epandrium, dorsal view. 17. left epandrial lamella and left cercus, lateral view.

FIGURES 12 – 14. Platypalpus cummingi sp. nov., male. 12. right epandrial lamella, lateral view. 13. cerci and epandrium, dorsal view. 14. left epandrial lamella and left cercus, lateral view.