FAMILY CULICID.T2 THE MOSQUITOES 99 



19. Dorsocentral and pre-scutellar bristles absent; pronotal lobes approxi- 



mated 20 



Dorsocentral and pre-scutellar bristles well developed; pronotal lobes 

 well separated 21 



20. Postnotum usually bare (Neotropical) Ha^masogiis Williston 



Postnotum usually with bristles (Oriental) Heizmannia Ludlow 



21. Post-spiracular area scaly; ? claws usually toothed; 9 palpi more than 



half as long as proboscis Armiseres Theobald 



Subg-en. Leicesteria Theobald 

 Post-spiracular area bare; ? claws simple 22 



22. All segments of 9 antenna, and last two of o antenna short and thick; 



middle femora with scale-tuft Aedeomyia Theobald 



Antennae normal, slender; middle femora without scale-tuft 23 



23. First segment of front tarsi longer than the last four together; fourth 



very short in both sexes Orthopodomyia Theobald 



First segment of front tarsi not longer than last four together; fourth 

 not shortened in ? 24 



24. Proboscis of o' much swollen apically, of ? slightly so, or else cell R2 



shorter than its stem Ficalbia Theobald 



Proboscis not swollen apically; cell R: at least as long as its stem. 



Mansonia Blanchard 



25. Head with numerous short hairs on vertex in addition to the orbital 



row; antennae thick in both sexes, not plumose in o' Opifex Hutton 



Head without hairs on vertex apart from the orbital row; antennae 

 slender in ?, nearly always plumose in cT 26 



26. Spiracular bristles present, even if few (American). .Psorophora Desvoidy 

 Spiracular bristles absent 27 



27. Eyes widely separated, space between them clothed with metallic 



silvery scales (Ethiopian) Eretmopodites Theobald 



Eyes less widely separated (sometimes touching), space between them 

 not covered with metallic silvery scales 28 



28. Wing-scales generally mostly narrow (when, rarely, all are broad, the 



9 claws are toothed); usually a few hairs on upper surface of stem- 

 vein 29 



Wing scales all very broad; 9 claws simple; stem-vein bare. 



Mansonia Blanchard 



29. Proboscis more slender, not recurved at tip in repose; ornamentation 



various Aedes Meigen 



Proboscis rather stout, recurved at tip in repose; dark species with 

 flat scales on vertex and scutellum Armigeres Theobald 



30. Wing-membrane without microtrichia (or these only visible under a 



high magnification); cell R2 shorter than its stem; An ends about 



opposite base of cubital fork Uranotaenia Arribalzaga 



Wing-membrane with distinct microtrichia (visible under a magnifica- 

 tion of 50) 31 



31. Postnotum bare; An (except in some species of Topomyia) ending little 



if at all beyond base of cubital fork; two or more posterior pronotal 

 bristles present (Palaeotropical) 32 



