Carpenter et al.: Mosquitoes of Southern U. S. 167 



Wing scales entirely dark or with only a small white-scaled patch at base of 

 costa ; abdomen entirely dark scaled dorsally or with only narrow basal white 

 bands (apices of the terminal segments may be white scaled) 13 



13. Scutum with a wide median longitudinal stripe of dark bronzy-brown scales, 



broadly margined laterally by pale-yellow to golden-yellow scales, these pale 



scales indenting the longitudinal stripe along the prescutal-scutal suture 



atropalpus (Coq.) , p. 220 



Scutum without a wide median longitudinal stripe of dark bronzy-brown scales 

 broadly margined with pale scales 14 



14. Hind tarsus with broad white rings present basally and apically on all segments 



except the last, which is entirely white; scutum clothed dorsally with golden- 

 brown scales - canadensis (Theob.), p. 173 



Hind tarsus with narrow white rings present basally and apically on segments 1 

 and 2 and basally on segment 3, the remaining segments entirely dark; scutum 

 clothed dorsally with bronzy-black scales except for a very narrow median 

 longitudinal line of golden-brown scales malhesoni Middk., p. 194 



15. Scutum without a bicolorous pattern, being evenly clothed with golden-brown 



scales (a little paler on anterior and lateral margins and on prescutellar 



space) ; palpi short in both sexes cinereus Meigen, p. 234 



Scutum with a definite pattern of bicolorous scales; palpi of males longer than 

 proboscis 16 



16. Scutum with a median longitudinal stripe of silvery-white to pale-yellow scales 



17 



Scutum without a median longitudinal stripe of pale scales 19 



17. Median longitudinal stripe extending the full length of the scutum, generally 



narrower than the dark-scaled area on either side (variable in A. Jupreei) 



18 



Median longitudinal stripe extending from the anterior margin of the scutum to 

 a little beyond middle, much broader than the dark scaled area on either side 

 infirmaius D. and K., p. 191 



18. Small species (wing about 2.5 mm.); occiput dorsally with a narrow median 



stripe of white lanceolate scales bounded submedially by a patch of broad 

 white scales; the median longitudinal stripe of scutum silvery-white, about 

 equal in width to the dark-scaled area on either side (very broad In males, 



covering most of the dorsal surface) - aiipreei (Coq.), p. 182 



Medium sized species (wing about 3.5 mm.) ; occiput dorsally with a median 

 stripe of white lanceolate scales bounded submedially by a patch of broad 

 dark scales; the median longitudinal stripe of scutum usually pale yellow, a 

 little narrower than the dark-scaled area on either side (similar In males) 



ailanticus D. and K., p. 1 70 



tormentor D. and K., p. 214 



19. Scutum with a pair of broad submedlan stripes of white to whitish-yellow 



scales, dark-brown scaled medially and laterally trivittatus (Coq.), p. 217 



Scutum without a pair of pale submedlan stripes, but with a single broad dark 

 stripe medially, pale scaled laterally 20 



20. Scutum medially with a golden-brown scaled longitudinal strlp>e about as wide as 



the areas of pale yellow scales on either side; dark portions of femora 

 speckled with pale scales; tibiae and segment I of tarsi pale scaled on one side 



for nearly the entire length sticticus (Meigen), p. 203 



Scutum medially with a dark-brown to black scaled longitudinal stripe; dark 

 portions of femora not speckled with pale scales; tibiae and segment I of 

 tarsi not pale scaled on one side or only slightly so 21 



21. Median longitudinal dark stripe of scutum broadly margined on anterior half by 



white lanceolate scales; posterior pronotum clothed with broad appressed white 



triserialus (Say), p. 224 



Median longitudinal dark stripe of scutum broadly margined on anterior half by 

 gold lanceolate scales; posterior pronotum clothed with gold lanceolate scales 

 not appressed ihihaiilti D. and K., .211 



