10. 
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 
comparatively Slend Crees waces on eaten Seiwa ae eat ee 
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 apicaliy, the stem stout and constricted near middle; 
sidepiece subspherical, with a dense patch of fine hairs on inner sur- 
REA C C ents aes Dire Se oes Weta ts ee ee eee ane ae SE Culer = 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 
leaflet__ a A A a Ss es MO NS a TNE Sree NA 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 palpilong.or short, not clubbed\at tipl.2=-- = 222s. = 
. Proboscis rigid, outer half tapered and strongly curved downward; 
secutellum evenly rounded and scaled 
Tribe Megarhinini, genus Megarhinus 
Proboscis flexible, not bent downward; scutellum trilobed, with sepa- 
EAC CsCUO SOI Cla Cw a= eet Sto eles Sa le 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 
Postnotumybaresisquamae-with a fringe of Nairsi 2225022 5 se 
Postspiracular bristles present; segment 1 of abdomen narrowed, seg- 
ment 8 much narrowed and retractile_ s stele Be 
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 retr actile os = oe ae 
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 scaling usually basal; 
scales of thorax narrow or only slightly broadened____ 2___-Aedes 
Spiracular bristles present ; base of subcostal vein with a tuft of hairs 
OnmUnGeRe cide of: a.winee =. = ee ee OAS CLE, 
Spiracular bristles absent; hairs absent on under side of subcostal vein__ 
. Wing scales broad, mixed brown and white; setae absent at base of 
Vil retee ee as eee Norte ee die ce hot, Shears oN 4 Ten ets eechiee 
Outstanding wing scales narrow or only slightly broadened, dark; a few 
setae near base of vein 1 on upper side of wing____~ aE Ss Seine ee 
Fourth segment of fore tarsi very short; lower mesepimeral 
bristles absent; mesonotum with longitudinal lines of white 
SCAG eats 28 2a re eo = _Orthopodomiyia 
Fourth segment of fore tarsi normal: lower mesepimeral bristles pres- 
ent; mesonotum without lines of white scales__ See M CN SONUG 
Antennae not longer than proboscis, the first flagellar segment of nor- 
mal length; male with bushy antennae and long palpi (in United 
States species) _____ __ Rese BAe a ___ Culex 
Antennae much longer than proboscis, the first flagellar segment as 
long as several of succeeding segments; male antennae and _ palpi 
Similars tomthosesOferemalemse. = see yes. | oie See Deinocerites 
79 
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