INSECUTOR INSCITI^ MENSTRUUS 25 



apical lobe low-conical, large, with dense recurved or flattened 

 short setae ; basal lobe quadrately expanded, tubercular-setose, 

 the setae longer and denser about the marginal spine, which is 

 very stout and contrasted. Harpago with short hirsute stem, 

 the filament rather broadly fusiform with pointed tip, about 

 one-half as long as the stem. Harpes and unci normal. Basal 

 appendages rather long, with five or six terminal and sub- 

 terminal spines. 



Types, male and female. No. 22618, U. S. Nat. Mus. ; Prince 

 Rupert, British Columbia, May 26, 30, 1919 (H. G. Dyar). 



Larva : Head-hairs in twos, or the lower single ; lateral comb 

 of the eighth segment of seven large scales, each with long 

 pointed tip, shortly and sparsely fringed at base. Air-tube 

 two-and-a-half times as long as wide ; pecten of evenly spaced 

 teeth, followed by a 6-haired tuft. Anal segment ringed by 

 the plate, rather short and broad, the ventral brush obliquely 

 posteriorly directed. 



Larvae in muskeg-pools in May. The larvae are pale in 

 color, whitish, and occurred sparsely in the pools, in two cases 

 but one larva in a pool. 



Total, 44 specimens : Prince Rupert, British Columbia, May 

 22-June 13, 1919; Ketchikan, Alaska, June 20, 1919; Cape 

 Fanshaw, Alaska, June 22, 1919 ; Juneau, Alaska, June 23, 

 1919. 



Aedes aboriginis Dyar. 



A'edes aboriginis Dyar, Ins. Ins. Mens., v, 99, 1917. 



The larvae from Prince Rupert dififer slightly from those 

 from the type locality (Mount Rainier, Washington). The 

 head hairs are more numerous, upper in 5, lower in 3 or 4, 

 instead of upper in 3 or 4, lower in 2 or 3. The comb-scales 

 of the eighth segment have the central spine more sharply 

 diflferentiated — the scale should be described as with a central 

 thorn and long lateral spinules rather than evenly spined. 

 Otherwise no differences appear. 



The larvae frequent pools of a semi-stagnant character, or 

 drainage pools, not typical muskeg pools. These pools are 



