Key to adult males of the genus Psectrotanypus

1. AR = 1.8 ........................................................................................................................ 2

­ AR = 1.8... ..................................................................................................................... 3

2. Tergites with lateral bands (Oriental) .................................................. P. lateralis sp. n.

­ Abdomen uniformly brown (Afrotropical) .................................. P. schwetzi (Freeman)

3. Abdomen uniformly brown (Nearctic) .................................. P. pictipennis (Zetterstedt)

­ Abdomen with dark bands............................................................................................. 4

4. AR> 2.1 (Palaearctic) ............................................................ P. yoshimurai (Tokunaga)

­ AR = 2.1 ........................................................................................................................ 5

5. Fore tibiae without apical setae (Nearctic) ................................. P. discolor (Coquillett)

­ Fore tibiae with apical setae .......................................................................................... 6

6. Tergites II–V with transverse, anterior brown band, without additional spots (Nearctic) ......................................................................................................... P. dyari (Coquillett)

­ Tergites I–V each with anterior brown band and 2 additional rounded median dark spots (Oriental, Palaearctic) ............................................................ P. varius (Fabricius)