Empididae. 37 



10. Golour shining black 9. tarsata. 



— Golour grey or dark brown 11. 



1 1. Golour blackish brown 10. obscura. 



— Golour grey 12. 



12. Male genitalia relatively small, without a long projecting 



penis; legs in the female not pennate 11. simplex. 



— Male genitalia large or with a long, thin, projecting 

 penis; legs in the female pennate 13. 



13. Male genitalia large, penis not long projecting; posterior 



legs of the female pennate; length 3,5 — 5 mm 13. plumipes. 



— Male genitalia smaller, penis projecting, long and thin; 

 in the female only the hind tibiæ pennate on the 



dorsal side; length 2,/) mm 12. tihiella. 



14. Acrostichal bristles present 15. 



— Acrostichal bristles absent, or (in gihha) exeedingly 



Short 19. 



15. Acrostichal bristles distinctly biserial; thorax grey in 

 both sexes; hind legs in the male of peculiar shape; 



male genitalia large 16. 



— Acrostichal bristles more or less irregularly or in- 

 distinctly biserial, or uniserial; thorax black or dark 

 brown in the male, grey in the female, or the whole 



body yellow; male genitalia small 17. 



16. Thorax grey, abdomen yellow; male genitalia large, 

 hind femora with tufts of hairs at the apex; legs in 



the female pennate 14. pennata. 



— Thorax and abdomen grey; male genitalia with long 

 lamellæ and a long projecting penis ; hind legs of a 



curious shape; legs in the female not pennate 15. dentipes. 



17. Golour yellow in both sexes, thorax not striped; an- 

 tennæ inserted above the middle; eyes in the male 

 narrowly separated 16. fiava. 



■— Golour dark in both sexes, or yellow in the female 

 but then thorax somewhat distinctly striped; antennæ 

 inserted in the middle 18. 



18. Thorax black in the male, grey in the female; hind 

 femora with no bristle towards the middle on the 

 ventral side; wings in the male brownish; length 



4,5 — 5 mm 17. cuUcina. 



— Thorax black in the male, body quite yellow in the 

 female; hind femora with a ventral bristle towards 



the middle; wings in the male darker; length 3,5 — 4 mm. 18. hyhrida. 



1 9. Halteres dark or black 20. 



— Halteres pale 21. variabilis. 



20. Small, robust, black shining species; eyes in the male 

 very narrowly separated; discai cell long; hind legs 



in the female somewhat pennate 22. gihha. 



— Slender species ; eyes touching in the male ; discai 

 cell not long, situated somewhat near the base; legs 



in the female not pennate 21. 



