FAMILY CULICID.T: THE MOSQUITOES 97 



5. Tibial spurs 1-2-2*; metapleural hairs present Cryophila Edwards 



Tibial spurs 1-1-1; metapleura bare Promochlonyx Edwards 



6. Clypeus as long as the head; claws larger and toothed. 



Euforethra Underwood 

 Clypeus shorter than the head; claws small and simple. 



Chaoborus Lichtenstein 



7. Abdomen without scales; or at least with the stemites largely bare 



(Anophelini) 8 



Abdomen with both tergites and sternites completely clothed with 

 scales 10 



8. Scutellum slightly trilobed Chagasia Cruz 



Scutellum evenly rounded 9 



9. Stem of median fork wavy Bironella Theobald 



Stem of median fork straight Anopheles Meigen 



10. Proboscis not rigid, of uniform thickness (unless swollen at tip), outer 



half not bent backwards (Culiciiii) 11 



Proboscis rigid, outer half slender and bent backwards (Megarhinini). 



Megarhinus Desvoidy 



11. Squama fringed (fringe usually complete, rarely interrupted); vein An 



reaching well beyond base of cubital fork 12 



Squama bare or rarely with 1-4 short hairs 30 



12. Pulvilli present; pleural chaetotaxy well developed, but spiracular and 



post-spiracular bristles absent 13 



Pulvilli absent or rudimentary 14 



13. Second antennal (first flagellar) segment short in both sexes; antennae 



of c5" nearly always plumose Culex Linnaeus 



Second antennal (first flagellar) segment elongate in both sexes; an- 

 tennae of o' not plumose Deinocerites Theobald 



14. Post-spiracular bristles absent; claws of ? simple (except in Leices- 



teria, Haemagogus, and Heizmannia) 15 



Post-spiracular bristles present, even if only one or two; claws of ? 

 usually toothed; dorsocentral and upper sternopleural bristles nearly 

 always well developed 25 



15. Spiracular bristles present (sometimes only one or two) 16 



Spiracular bristles absent 19 



16. Several upper sternopleural bristles; stem-vein usually hairy beneath. 



Theobaldia Neveu-Lemaire 

 At most one or two upper sternopleural bristles; stem-vein bare be- 

 neath 17 



17. Postnotum nearly always bare (Oriental and Australasian). 



Tripteroides Giles 

 Postnotum with bristles (Neotropical) 18 



18. Clypeus with setae Trichoprosopon Theobald 



Clypeus bare Gceldia Theobald 



* Posterior four tibia' each with two apical spurs. 



