26. 
28. 
29. 
36. 
41. 
4 
Lower head tuft with three long hairs, the upper multiple. In permanent 
water, with a northern distribution____________- Culiseta absobrinus Felt. 
Lower and upper head tufts alike, multiple -_--__--______-_____________ 27 
Basal pecten teeth of the air tube with one branch. In pools, barrels, etc., 
with western distribution ---_-_---__--_--_ Theobaldia incidens Thomson. 
Basal pecten teeth of air tube with several branches. In pools, with eastern 
and southern distribution == 2) 22 = 2 es Culiseta consobrinus Desvoidy. 
Aur tulbeswith severale liars twits =e ee eee ane 29 
Aimtube with only one pair oftultsioe. +2 9 e8its ae eee 30 
Air tube long; anal segment with a complete ring. Living in pools and 
MaMMIbAancels Sk Saw gee A 2 ee cae ae Culex restuans Theobald. 
Air tube short; anal segment not fully ringed. An early spring species. 
Ochlerotatus trichurus Dyar.! 
Anmtube withuthevhairituitiwithin the spectent= =.= === =e eee 31 
Mirtube with the hair tuft beyond the pecten) —_ 225222222 eee 33 
Amalisesmentminged with a horny: plates 222s 32 
Anal segment not ringed. In pot holes in rocks. 
Ochlerotatus atropalpus Coquillett. 
Lateral comb of the eighth segment a few scales in a row. In swamps, with 
avsouthern distribution --___________=_ Aédes tormentor Dyar and Knab.? 
Lateral comb of the eighth segment a large patch of scales. 
Ochlerotatus bimaculatus Coquillett. 
Peciten of the air tube with detached teeth outwardly _-_----_------------ 34 
Pecten of the air tube with all the teeth evenly spaced __+_____._.__-_--_ 38 
Air tube four times as long as wide; lateral comb of the eighth segment a 
patch of scales three rows deep. An early spring species. 
Ochlerotatus abfitchii Felt. 
Air tube three times as long as wide or less; lateral comb of the eighth 
segment or few SCales...- 2s 2520 22. eee 35 
Antenne enlarged basally; tuft rather beyond the middle. An early spring 
SDCCLES eee eer etee Sere rae a ee _ Ochlerotatus aurifer Coquillett. 
Antennz moderate only; the tuft before the middle _____~._____________ 36 
The two rows of the pecten of the air tube approximate behind; dorsal plate 
of anal segment a saddle only. An early spring species. 
Ochlerotatus impiger Walker. 
The two rows of pecten well separated; dorsal plate more than half encir- 
clinestheranal:segment =2__...-_--_--. -.-4=8-J'¢ 4 eee 37 
Tuft of the tube before the outer third; anal gills blunt. In rain puddles. 
Ochlerotatus sylvestris Theobald. 
Tuft of tube beyond the outer third; anal processes pointed. In rain puddles. 
Aédes fruscus Osten-Sacken. 
Comb scales few, in a single or irregularly single row ___________ -__--- _ 39 
Comb scales more numerous to many, in a patch__.____-_-_______------ 43 
Anal-sesment rincedsby themplatey ses se see ee 40 
Anal segment not completely ringed by the plate ~___-___- 1 Ree 2 
Analgoullssmodenate; mornvall =a as ee ee ees Lp Sih yea tL 
Anal gills very long with stout central trachea. In pools, not coming to the 
surface; distribution southern ___________ Ochlerotatus dupreei Coquillett. 
Pecten of air tube running about one-third; anal segment not longer than 
wide. An early spring species _____________- Ochlerotatus punctor Kirby. 
Pecten of air tube running about one-half; anal segment longer than wide. 
Aédes atlanticus Dyar and Knab.? 
l Ochlerotatus cinereoborealis. 
2 Ochlerotatus serratus (in part). 
