Carpenter et al.: Mosquitoes of Southern U. S. 169 



dupreei (Coq.) , p. 1 83 



Filament of claspette expanded blade-like on convex side 16 



16. Enlarged spine of basal lobe with tip flattened, broadened, and usually slightly 



retrorse fulviis pallens Ross, p. 186 



Enlarged spine of basal lobe sharply pointed, usually somewhat recurved 17 



17. Basal lobe with a dense subapical tuft of fine long setae adjacent to the enlarged 



spine, distinct from the other shorter setae on the basal lobe 



sticticus (Meigen) , p. 203 



Basal lobe without a distinct subapical tuft of fine long setae adjacent to the 

 enlarged spme 18 



18. Basal lobe bearing a few large setae, in addition to numerous small setae and an 



enlarged spine; claspette filament more than one one one-half times as long 



as claspette stem canlalor (Coq.), p. 178 



Basal lobe without a few large setae, bearing only small setae and an enlarged 

 spine; claspette filament less than one and one-half times as long as claspette 

 stem 19 



19. Margin of blade on convex side of claspette filament angulate near middle; 



claspette filament about as long as claspette stem or slightly longer 



stimulans (Walker), p. 206 



Margin of blade on convex side of claspette filament rounded; claspette filament 



about two-thirds to three-fourths as long as claspette stem 



grossbecl(t D. and K., p. 189 



LARVAE (fourth INSTAr) 



1. Anal segment completely ringed by the dorsal plate 2 



Anal segment not completely ringed by the dorsal plate 11 



2. Pecten with distal teeth widely spaced 3 



Pecten with all teeth more or less evenly spaced 4 



3. Subventral tuft of siphon inserted beyond pecten; lower head hair (B) single 



- nigromacuUs (Ludlow), p. 199 



Subventral tuft of siphon inserted within pecten; lower head hair (B) double, 

 sometimes triple fulviis pallens Ross, p. 187 



4. Comb scales arranged in a single (sometimes irregular) row usually less than 12 



m number 5 



Comb scales arranged in a triangular patch, usually more than 14 in number 7 



5. Subventral tuft of siphon inserted within pecten tormenlor D. and K., p. 217 



Subventral tuft of siphon inserted beyond pecten 6 



6. Anal gills more than 5 times as long as anal segment, with conspicuous darkly 



pigmented tracheae; lower head hair (B) double or triple; antennal hair 



usually double dupreei (Coq.), p. 185 



Anal gills never more than three times as long as anal segment, lacking conspicu- 

 ous darkly pigmented tracheae; lower head hair (B) single; antennal hair 

 multiple ailanlicus D. and K., p. 172 



7. Individual comb scale rounded apically, fringed with subequal spinules 



iaeniorhvnchus (Wied.), p. 209 



Individual comb scale thorn-like 8 



8. Dorsal preapical spine of siphon as long as apical pecten tooth; upper lateral 



abdominal hair usually double on segments III to V 9 



Dorsal preapical spine of siphon no more than half as long as apical pecten 

 tooth; upper lateral abdominal hair single on segments III to V 10 



9. Siphon 3 to 3!/2:l; pecten not quite reaching middle of siphon; lower and 



upper head hairs (B and C) well barbed milchellae (Dyar), p. 197 



Siphon 2 to 2'/2:I ; pecten reaching middle of siphon or slightly beyond; lower 



and upper head hairs (B and C) smooth or very finely barbed 



sollicllans (Walker), p. 200 



10. Apical spine of individual comb scale 3 or 4 times as broad and about twice as 



long as subapical spinules infirmaius D. and K , p. 192 



Apical spine of individual comb scale about twice as broad and generally about 



