THE MOSQUITOES OF THE SOUTHEASTERN STATES 
Subapical lobe not distinctly divided; apex of tenth sternite less strongly 
curved ; mesosomal plate without basal hook; outer end of mesosomal 
plate studded with small tubercles. Subgenus Neoculex, Culex apicalis 
. Basal division of subapical lobe of sidepiece divided into two subequal 
arms, each with a long, stout, capitate filament at tip; stem of clasper 
COMPATAIVELYVASLCN GC Leet te serene ek ee ae eee ee Pe ks 
Basal division of subapical lobe with one arm bearing a stout filament 
at tip and a second filament arising from a tubercle near the base; 
apical division of lobe with a very large, fan-shaped leaf; clasper 
greatly enlarged apically, the stem stout and constricted near middle; 
sidepiece subspherical, with a dense patch of fine hairs on inner sur- 
el CC Winner sea ee 8 she PNT ee eS ee eas MEE EAT 2S Culex peccator 
. Ninth tergite with a widened plate, the lobes projecting from its pos- 
terior corners aS a pair of short arms; apical swelling of clasper 
cap-Shaped, tapering abruptly; lobe of sidepiece without an expanded 
NO AH ess Se ER elard  eR r Cp  S  Nt, ey Culex pilosus 
Lobes of ninth tergite ovate, prominent, with numerous hairs; apical 
swelling of clasper moderate, gradually tapered; lobe of sidepiece 
with an expanded leaflet on the apical division______ Culex erraticus 
KEY TO GENERA 
. Abdomen with a vestiture of fine hairs; female palpi as long as proboscis; 
male palpi long, clubbed at tip; scutellum rounded 
Tribe Anophelini, genus Anopheles 
Abdomen covered with flat scales; female palpi much shorter than pro- 
boscis; male palpi long or short, not clubbed at tip_-________________ 
. Proboscis rigid, outer half tapered and strongly curved downward; 
scutellum evenly rounded and scaled 
Tribe Megarhinini, genus Megarhinus 
Proboscis flexible, not bent downward; scutellum trilobed, with sepa- 
Tetedetunts OlSClAGs Rae awe Wks aay eee ee Tribe Culicini 
. Wings with second marginal cell less than half as long as its petiole 
Uranotaenia 
Wings with second marginal cell at least as long as its petiole__________ 
. Postnotum with a tuft of setae; squamae without a fringe of hairs 
Wyeomyia 
Postnotum bare; squamae with a fringe of hairs_______________________ 
. Postspiracular bristles present; segment 1 of abdomen narrowed, seg- 
Menivs-mUeh AAarrOwed and LECLACtiles wees = Se 
Postspiracular bristles absent (except in Mansonia titillans, in which 
wing scales are very broad) ; segment 7 of abdomen not narrowed; 
segment 8 short but not retractile eae Se i ea 
. Spiracular bristles present; dorsal segmental pale scaling of abdomen 
usually apical; mesonotum with at least some broad appressed scales 
or (in subgenus Grabhamia) with simple claws in female__ Psorophora 
Spiracular bristles absent; dorsal abdominal pale sealing usually basal; 
scales of thorax narrow or only slightly broadened______________ Aedes 
. Spiracular bristles present; base of subcostal vein with a tuft of hairs 
Ons inNdenesIOe sO wills s== 22 hae toe ee 2 ee Theobaldia 
Spiracular bristles absent; hairs absent on under side of subcostal vein__ 
. Wing scales broad, mixed brown and white; setae absent at base of 
Outstanding wing scales narrow or only slightly broadened, dark; a few 
setae near base of vein 1 on upper side of wing__ ALSO Taha PS £43 
. Fourth segment of fore tarsi very short; lower mesepimeral 
bristles absent; mesonotum with longitudinal lines of white 
S@all eq Mieeceee wees Clue ee Pe gig eee eA oa Orthopodomyia 
Fourth segment of fore tarsi normal; lower mesepimeral bristles pres- 
ent ; mesonotum without lines of white scales_______--________ Mansonia 
. Antennae not longer than proboscis, the first flagellar segment of nor- 
mal length; male with bushy antennae and long palpi (in United 
SHALCSE_ SINC CECG)) ents ta reper ee ren i Be Sw Culex 
Antennae much longer than proboscis, the first flagellar segment as 
long as several of aa segments; male antennae and palpi 
Sinmilarato: those of females. tease a be Set Deinocerites 
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