170 American Midland Naturalist Monograph No. 3 



1 1/3 times as long as subapical spinules trivillalus (Coq.), p. 219 



1 1 . Suhventral tuft of siphon inserted within pecten ; pecten with three or four distal 



teeth widely spaced alropalpus (Coq.), p. 222 



Subventral tuft of siphon inserted beyond pecten; pecten either with distal teeth 

 widely spaced or all teeth rather evenly spaced 12 



12. Upper head hair (C) multiple 13 



Upper head hair (C) single or double 19 



13. Pecten with distal teeth widely spaced 14 



Pecten with all teeth rather evenly spaced 15 



14. Preantennal hair, lower head hair, and upper head hair (A, B, and C) inserted 



in a straight line; upper lateral abdominal hair single on segments III to V 



cinereus Meigen, p. 236 



Preantennal hair, lower head hair, and upper head hair (A, B, and C) not in- 

 serted in a straight line; upper lateral abdominal hair double or triple on 

 segments III to V vexans (Meigen), p. 232 



15. Lower head hair (B) double (sometimes single or triple) 16 



Lower head hair (B) with 3 or more branches 17 



16. Comb scales each with a long apical spine and short lateral spinules 



sticiicus (Meigen) , p. 204 



Comb scales each with lateral spines nearly as long as apical spine 



grossbeclfi D. and K., p. 190 



17. Inner preclypeal spines separated by a little more than the length of one spine, 



lightly pigmented; siphon about 4J/2 to 5:1 ; upper lateral abdominal hair 3 to 



4-branched on segments I and II ihibaulii D. and K., p. 214 



Inner preclypeal spines not separated by more than the length of one spine, 

 darkly pigmented; siphon about 2|/2 to 4:1; upper lateral abdominal hair 

 usually double on segments I and II 18 



18. Anal gills usually about as long as the anal segment; siphon 3 to 4:1 



canadensis (Theob.), p. 175 



Anal gills usually very short, bud-like; siphon about 21/2:1 



caniaior (Coq.) , p. 1 78 



19. Comb of many scales (usually more than 20) arranged in a sub-triangular 



patch; antennal hair multiple 20 



Comb of about 7 to 1 5 scales in a single or partly double row ; antennal hair 

 single (rarely forked) 2 1 



20. Upper head hair (C) double; anal gills about as long as the anal segment; sub- 



ventral tuft of siphon 3 to 4-branched slimulans (Walker), p. 207 



Upper head hair (C) single (rarely double) ; anal gills usually very short, bud- 

 like; subventral tuft of siphon usually with 5 to 9 branches 



dorsalis (Meigen), p. 182 



21. Lower head hair (B) 2 to 4-branched; preantennal hair (A) multiple; indi- 



vidual comb scale long, gradually tapered, evenly fringed with fine short 



spinules triseriatus (Say), p. 225 



Lower head hair (B) single; preantennal hair (A) single; individual comb 

 scale with a strong apical spine and several shorter stout thorn-like lateral 

 spines aegppfi (Linn.), p. 229 



Aedes (Ochlerotatus) atlanticus Dyar and Knab 



Aedes atlanticus Dyar and Knab, 1906, Jour. N. Y. Ent. Soc, 14:198. 



ADULT female. — Medium sized species. Head: Proboscis dark scaled; 

 palpi short, dark. Occiput dorsally with a rather broad longitudinal stripe of 

 white lanceolate scales, extending forward between the eyes; this median stripe 

 bounded on either side by a large submedian patch of broad dark scales; lateral 

 region of occiput clothed with broad appressed dingy-white scales. Erect forked 

 scales numerous, those on central portion of occiput pale. Thorax: Integument 



