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Air tube over five times as long as wide, nearly straight, without marked 
tapering ; living in fresh-water pools, rain barrels, etc. 
Culex salinarius Coquillett. 
Air tube less than five times as long as wide, tapering rather rapidly after 
the middle, somewhat fusiform in shape-._____._--__2_.1.._2.=_-_2__- 14 
Air tube five times as long as wide, its pecten of 15 teeth; subdorsal hairs of 
third and fourth abdominal segments double. Introduced domestic 
BERS UNICO Mes hee ye nt OS Es Ee Culex pipiens Linnzeus. 
Air tube four times as long as wide, its pecten of nine teeth; subdorsal hairs 
of the third and fourth abdominal segments single. Southern domestic 
TEC RR EUL CCN SEAN 9 ee Os Culex fatigans Wiedemann. ! 
Air tube slightly expanded at tip. Summer swamp mosquito. The adult 
GOESRnObabites meets sree ee EN ie en Culex territans Walker. 
Air tube evenly tapered to tip. Living in permanent pools all summer. 
Culex tarsalis Coquillett. 
Bars of comb in a perfectly regular row; skin smooth. Hibernates as fully 
grown larva in permanent pools_____ Melanoconion melanurus Coquillett. 
Bars of comb in an irregular row; skin minutely pilose. 
Mochlostyrax erraticus Dyar and Knab.? 
Air tube strongly inflated; anal segment with a chitinous ring, pierced by a 
LOMO tULSpaLoOn ob heaventrall line 32 512s a ee ee eee 18 
Air tube not inflated ; anal segment not ringed, or, if so, without tufts along 
themventreal eine peewee sere 2 lest le fo i nahh oi ee ee ee 20 
Nmibennsceloneyandspromimentmes 2302) ose is Se eee 19 
Antenne less long, moderate only. Developing rapidly in rain puddles. 
Grabhamia jamaicensis Theobald. 
Lateral comb of the eighth segment of six or seven nearly equal teeth. 
Developing rapidly in rain puddles__ Janthinosoma sayi Dyar and Knab.* 
Lateral comb of the eighth segment of five teeth, the upper and lower 
Oimngs TON) Ss ee Janthinosoma varipes Coquillett. 
Antenne inflated and bent. Rapidly developing in rain puddles. 
Grabhamia discolor Coquillett. 
Aten motemanked ly inflated or. bent. -_1+.--2222-2 222-222-222 ee 21 
Head with a lateral prominent angle which receives a process on the man- 
dible. In crab holes on the Florida coast__ Deinocerites cancer Theobald. 
Headmnnonoutmsrchuanednn olen (Jaci sho) Wl! 22 nas is 2d ee 2D 
Headiwathetihick«club-like hairs. —-_------_..---- 2222-5 Genus Uranotenia.4 
ieadewithwihe usialktime: hairs only) 2. --.222 22-2252 ee Se 23 
Air tube without pecten; several chitinous plates on the abdominal seg- 
ments. In hollow trees and rain barrels__-Pnewmaculex signifer Coquillett. 
Air tube with pecten ; abdominal segments without any plates before the 
Dir HVS so eo oe ee eee ae eee 24 
Air tube bottle-shaped, the outer half linear. 
Teniorhynchus perturbans Walker. 
MTSU eRe SulabivebaApereG@is 252-2 22-20 le ee ee eee a 20 
Air tube with a row of hairs beyond the pecten, the pair of tufts at base of 
WHOS esee tele t eee eS ee apse it ni wl Gores 8 26 
Air tube without a row of hairs; the tuft at or beyond the middle of the 
(illegal Pe 28 
1 Culex pipiens (in part). Not the true fatigans of India, but so called by Theobald. ‘he proper 
name of our species appears to be Culex cubensis Bigot. 
2Melanoconion atratus (in part). 
3 Janthinosoma posticata. 
4'Three species differentiated by minute characters. Only one species is at all common, Ura- 
notenia sapphirina Osten-Sacken. 
