120 
Psyche 
[December 
with dorsal chitinous plates on the sixth, seventh and 
eighth segments: Orthopodomyia 
5. Head elongate, elliptical; head hairs single, stout like 
heavy spines: Uranotxnia 
Head nearly circular or transverse ; head hairs not like 
heavy spines 6 
6. Air tube with several pairs of ventral tufts : Culex 
Air tube with a single pair of ventral tufts or with a 
single pair of tufts and a median ventral row of 10 
to 12 unpaired tufts or without any paired ventral 
tufts 7 
7. Air tube with the paired hair tufts placed close to the 
base between the pecten rows : Theobaldia 
Air tube with the paired hair tufts placed near or be- 
yond the middle 8 
8. Anal segment ringed by the dorsal plate, with tufts of 
the ventral brush piercing the ring : Psorophora 
Anal segment not ringed by the dorsal plate, or if ringed, 
the tufts of the ventral brush posterior to the ring:__._ 
Aedes 
Key to the Genus Aedes 
Adults 
1. Proboscis of female ringed with white (Fig. 1) 2 
Proboscis of female not ringed with white ____3 
2. Abdomen with a pale longitudinal dorsal stripe (Fig. 1) ; 
wings with black and white scales : ^m f sollicitans 
Abdomen without a pale longitudinal dorsal stripe; 
wings with black scales : tseniorhynchus 
3. Tarsi with white rings on at least some of the segments 
(Fig. 1) 4 
Tarsi without white rings 11 
4. White tarsal rings involving both ends of segments 5 
White tarsal rings basal only 7 
5. Wings scales markedly bicolored : dorsalis 
Wings scales uniformly dark, or nearly so 6 
6. Mesonotum uniformly reddish brown, or nearly so : 
canadensis 
Mesonotum pale with a broad dark medium stripe ; ab- 
domen rather bluntly rounded : atropalpus 
