Hercostomus plagiatus

Grichanov, Igor Ya., 2015, Palaearctic species of the Hercostomus plagiatus group (Diptera: Dolichopodidae) with description of a new species from the Middle East, Zootaxa 3918 (3), pp. 424-432 : 425-426

Key to West Palaearctic species of Hercostomus plagiatus group (males)

1 Antennal postpedicel clearly acute, about 1.5X as long as high; wing veins R4+5 and M1+2 parallel along most of their length, slightly convergent near wing apex; hypopygium with club-shaped cercus bearing several small, yellow scale-like inner setae along distodorsal margin; apicoventral epandrial lobe bearing 3 setae apically on knob ( Pollet 1993, fig. 1)................................................................................................... H. plagiatus (Loew)

- Antennal postpedicel subtriangular, about as long as high; wing veins R4+5 and M1+2 parallel along most of their length or distinctly convergent towards wing apex ( Figs 2 , 3 ; Pollet 1993, fig. 2); hypopygium with ovoid or triangular cercus without scale-like setae; apicoventral epandrial lobe bearing 2 setae on its knob and 1 longer seta on stem..................... 2

2 Wing veins R4+5 and M1+2 distinctly convergent towards wing apex; hypopygium with ovoid cercus; epandrial lobe bearing seta on stem right before knob ( Pollet 1993, fig. 2)................................................. H. verbekei Pollet

- Wing veins R4+5 and M1+2 parallel along most of their length, slightly convergent near wing apex; hypopygium with triangular cercus; epandrial lobe bearing very long seta at base of stem ( Figs 3 , 5 , 6 )...................... H. golanensis sp. nov.

Figures

FIGURE 2. Antenna of Hercostomus golanensis sp. nov.

FIGURE 3. Wing of Hercostomus golanensis sp. nov.

FIGURE 5. Hypopygium of Hercostomus golanensis sp. nov., ventral view.

FIGURE 6. Hypopygium of Hercostomus golanensis sp. nov., ventral side, left lateral view.