DOLICHOPODIM. 233 



12. Posterior cross-vein distant much more than its own length from 



the margin of the wing (measured on the fifth vein, 19) . 13 

 Posterior cross-vein distant about its own length from the mar- 

 gin. ........... 14 



13. Second antennal joint prolonged along the inner side of the third. 



Cceloglutus. 



Second antennal joint not so prolonged, or forming a cup for the 

 third (19, b, c) Thrypticus. 



14. Third and fourth veins parallel towards the tip (25, i). 



Aphrosylus. 

 Third and fourth veins convergent (18, g) . . Medeterus. 



15. The face of the male extends far below the eyes, hanging down 



apron-like before the mouth (f ) . . . . Polymedoii. 



The face of the male reaches about as far as the lower edge of the 



eyes, head vertically elongated (1O, d, j). Tachytrechus. 



Face of the male reaching as far as the lower edge of the eyes, but 

 the head not elongated. ..... Paraclius. 



Face of the male not reaching as far as the edge of the eyes. 16 



16. Third and fourth veins parallel towards the tip. . . . 17 

 Third and fourth veins distinctly convergent. . . . 19 



17. Bristles of thorax yellow (19, b, c) . . . . Thrypticus. 

 Bristles of thorax black. ....... 18 



18. First antennal joint bare above. . . . Peloropeodes. 

 First antennal joint hairy above (15, a) . . Gymnopternus. 



19. The last segment of the fourth vein gradually approaching the 



third (26, a, c, d, e, h). . . . , Hercostomus. 

 Last segment in the middle abruptly curving forward, then grad- 

 ally resuming its former course, ending near the third vein. 



Paraclius. 



20. Costal vein extending only to the tip of the third vein, the latter 



part of the fourth vein evanescent (9, b) . . Asyndetus. 

 Costal and fourth veins normal. . . . . . . 21 



21. First antennal joint hairy above. ...... 22 



First antennal joint bare above. ...... 26 



22. Fourth vein towards the tip strongly curved forward, nearly join- 



ing the third at the margin (14, 27, 31, d) . Pelastoneurus. 

 Fourth vein parallel with the third, or slightly convergent. 23 



23. Arista dorsal, face very narrow, palpi small. . Anepsius. 



