86 
D1. 
4. 
MISC. PUBLICATION 336, U. S. DEPT. OF AGRICULTURE 
Anal segment not completely ringed by the sclerotic plate. [Lateral hairs 
normally double or triple on segments 8 to 5.J______________ 
Anal segment completely ringed by the plate__.. >. 5 
. Antennal hair single (rarely forked) ; comb of few (8 to 15) scales in a 
single or -—partly: double row 222 92262 2e 6 ee a ee 
Antennal hair multiple; comb of many scales in a patch______._ 
Single comb scale with a stout apical spine and shorter side spines 
(fig. 26, C) ; head hairs and preantennal hair single: tuft of air tube 
with three or more branches; lateral hair of anal segment single 
or double Se eee A. aegypti 
Single comb scale elongate, evenly fringed with short spinules (fig. 26, 
D); lower head hair with two to four branches; preantennal and 
lateral hair of anal segment multiple; tuft of air tube usually single 
or double: 22.3). 25). Set Se a eee A. triseriatus 
Upper head hair double; anal gills as long as the segment; single 
comb scale pointed, with an apical spine somewhat longer than others; 
body. glabrous. >= ine ee Ese ee A. stimulans 
Head hairs usually single; anal gills very short, budlike: comb scale 
rounded, fringed apically with subequal spinules__________ A. dorsalis 
OOZ5 7117 
—— 
QOZ5 1717 
FIGURE 26.—Enlarged comb scales of Aedes larvae: A. sollicitans; B, 
taeniorhynchus ; C, aegypti; D, triseriatus. 
. Comb of few scales (less than 12) in a single row. [Single comb scale 
pointed, thornlike; lateral hairs usually single on segments 8 to 5; 
dorsal, preapical spines on aim tube Small. |=. 3s-2 ee 
Comb of. many .Scales”in-a . pateb=_ 22223 3S ea eee 
. Tuft of air tube. beyond the. -pecten® 22 222 er eee eee 
Tuft of air tube before end of pecten; anal gills about twice the 
length o£ segment .==)°)- 22.0.e a ee ee eer ee _A. tormentor 
. Anal gills very long with prominent tracheae; lower head hairs double 
or triple; antennal hair usually double Ss A. dupreet 
Anal gills no more than twice length of segment, one pair longer than 
the other; head hairs single; antennal hair multiple____-- A. atlanticus 
. Comb scale thorn-shaped, with a long apical spine and smaller lateral 
spinules (fig. 26, 4) ; lateral abdominal hairs single or double____~_ se: 
Comb scales rounded apically, with a fringe of subequal spinules (fig. 
26, B) ; lateral hairs on segments 8 to 5 with three or more branches. 
[Body distinctly pilose; air tube short, 2:1 or less, dorsal preapical 
spines nearly as long as pecten teeth; antennal hair small, usually 
double: or: triples)|-22 > = 2 ee ee ee _A. taeniorhynchus 
. Dorsal preapical spines of air tube (fig. 24, 4) as long as apical pecten 
tooth; lateral abdominal hairs usually double on segments 8 to 5, body 
glabrous .or: Dearly) .SQ2- =>. == ee eee Conia Sy 
