80 



MISC. PUBLICATION 336. U. S. DEPT. OF AGRICULTURE 



53. 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 A. stimulans 



Head hairs usually single; anal gills very short, budlike; comb scale 

 rounded, fringed apically with subequal spinules A. dorsalis 



54. Comb of few scales (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.] 55 



Comb of many scales in a patch 57 



55. Tuft of air tube beyond the pecten 56 



Tuft of air tube before end of pecten; anal gills about twice the 



length of segment A. tormentor 



56. Anal gills very long with prominent tracheae ; lower head hairs double 



or triple ; antennal hair usually double 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 



i 1 



0.025m/n ( 1 



0.025 mm 



Figuee 26. — Enlarged comb scales of Aedes larvae: A, A. sollicitans; B, A. 

 taeniorhynchus; C, A. aegypti; D, A. triseriatus. 



57. Comb scale thorn-shaped, with a long apical spine and smaller lateral 



spinules (fig. 26, A) ; lateral abdominal hairs single or double 53 



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 triple.] A. taeniorlxynclius 



58. Dorsal preapical spines of air tube (fig. 24, A) as long as apical pecten 



tooth; lateral abdominal hairs double on segments 3 to 5, body 



glabrous or nearly so 59 



These spines small, not more than half as long as apical pecten tooth ; 

 lateral hairs single on segments 3 to 5 ; anal gills longer than 

 anal segment 60 



59. Air tube about 3:1; anal gills longer than segment, tapered to a 



blunt point A. mitclxellae 



Air tube about 2:1; anal gills shorter than segment, budlike 



A. sollicitans 



60. Apical spine of comb scale longer than lateral spinules by about half 



its length; body sparsely spiculate ; anal gills longer than the seg- 

 ment; pecten ends about at middle of air tube A. infirmatus 



Lateral spinules of comb scale nearly as long as apical spine; body 

 glabrous; pecten extending beyond middle of air tube. (From pub- 

 lished descriptions, 68, 112) A. trivittatus 



