Pseudohercostomus, Stackelberg, 1931

Grootaert, Patrick & Velde, Isabella Van de, 2021, Understanding the tangled taxonomy of the genus Pseudohercostomus Stackelberg, 1931 (Insecta: Diptera: Dolichopodidae) with description of new species from Singapore and DR Congo, Raffles Bulletin of Zoology 69, pp. 324-335 : 334

Key to male Pseudohercostomus

1. Male with cerci twice as long as epandrium (Oriental Region) ..................................... P. sinensis Yang & Grootaert

– Male with cerci shorter than epandrium.................................2

2. Postpedicel apically rounded ..................................................3

– Postpedicel triangular (tip pointed) ........................................4

3. Propleural bristle white; fore coxa with white bristles; antenna black (Neotropical Region, Chile)............. P. allini Negrobov

– Propleural bristle black; fore coxa with back bristles; antennae yellowish-brown (Oriental Region) .......................................... .................................................. P. singaporensis , new species

4. Scape yellow; mesoscutum metallic blue with green reflections; 4–5 dorsocentral bristles bristling on squama entirely black (Oriental Region)............................... P. echinatus Stackelberg

– Scape brown; mesoscutum metallic green only; 6 dorsocentral bristles (anterior most short); bristling on squama partly white (Afrotropical Region)................... P. congoensis , new species