86 MISC. PUBLICATION 336, U. S. DEPT. OF AGRICULTURE 
51. Anal segment not completely ringed by the sclerotic plate. [Lateral hairs 
normallive double vor GripleyonESe sive ws resem oy | eee 52 
Anal sesment completely. ringzed= Dy atinen pl aie ama 55 
52. Antennal hair single (rarely forked) ; comb of few (8 to 15) scales in a 
single<or: partly double Tow 22225 2 = ee See ee ee eee 53 
Antennal hair multiple; comb of many scales in a patch_______-_______ 54 
53. 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 “COW DIOS Se ea ENE 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 doubles 222 = 22 es Soe en Te ee ees A. triseriatus 
54. 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 222202262 see Se) Ae a See ee A. stimulans 
Head hairs usually single; anal gillS very short, budlike; comb scale 
rounded, fringed apically with subequal spinules__________ A. dorsalis 
——————— 
OO02ZS5 1717 —— 
QO0Z5 1717 
FigurE 26.—Enlarged comb seales of Aedes larvae: A, sollicitans; B, 
taeniorhynchus ; C, aegypti; D, triseriatus. 
55. Comb of few seales (less than 12) in a single row. [Single comb scale 
pointed, thornlike; lateral hairs usually single on segments 3 to 5; 
dorsal: preapical spines on air tube small] = ee D6 
Comb: of many scales: inva’ patches aes ee ee eee D8 
56: Tutt of air: tube. beyond. the pectens-22 "2-22 eee aye 
Tuft of air tube before end of pecten; anal gills about twice the 
length of: segment2 =. < 2s S25 ee oe 2 ee ee A. tormentor 
of. Anal gills very long with prominent tracheae; lower head hairs double 
or triple; antennal hair-usually, doubles=—222 2 A. dupreei 
Anal gills no more than twice length of segment, one pair longer than 
the other ; head hairs single; antennal hair multiple____-- A. atlanticus 
58. Comb scale thorn-shaped, with a long apical spine and smaller lateral 
spinules (fig. 26, A) ; lateral abdominal hairs single or double_--__--~~ 59 
Comb scales rounded apically, with a fringe of subequal spinules (fig. 
26, B) ; lateral hairs on segments 3 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] 252222222 eS See eee A. taeniorhynchus 
59. Dorsal preapical spines of air tube (fig. 24, 4) as long as apical pecten 
tooth; lateral abdominal hairs usually double on segments 3 to 5, body 
SLADLOUS OR ecNS aT Gy IS Os See a oe ae 60 
