100 iNs:ecuTOR iNsciTi^ mh;nstruus 



Rainier National Park, Washington, issued June 17 to July 1, 

 1917 (H. G. Dyar). 



Adult females, Glacier, Washington, June 3, 1917 (H. G. 

 Dyar), and females and males, Lake Cushman, Washington, 

 June 26, 27, 28, 1917 (H. G. Dyar) ; Hoquiam, Washington, 

 May 27, 1904 (H. E. Burke), the latter erroneously recorded 

 under hexodontus by me (Ins. Insc. Mens., v, 14, 1917) ; old 

 specimens of this, the larger species, Ashford, Washington, 

 August 1, 1906 (Dyar & Caudell). 



The males were observed swarming at Lake Cushman in 

 small groups in the forest in the forenoon, bright sunlight 

 shining through the trees, but well screened by the dense 

 foliage. The swarms were on the dark side of the trunks of 

 enormous cedar trees, in one case growing upon a rocky bank, 

 which added to the shadow. The swarms were from 6 to 10 

 feet from the ground, varying from a few to 50 individuals. 



Aedes altiusculus, new species. 



Head and mesonotum as in aboriginis, the color a little less 

 yellow, more creamy. Abdomen black, with rather broad 

 basal segmental white bands, triangularly widened on the sides ; 

 venter white, with narrow apical segmental black bands. 

 Wings and legs as in aboriginis. 



Male with the venter gray-white scaled, narrow apical seg- 

 mental black bands and no trace of medioventral line. 



Genitalia (See Plate II). Apical lobe of sidepiece large, 

 with long straight setae; basal lobe expanded, setose, a long 

 stout seta on the outer (dorsal) side. Stem of harpago long, 

 the basal part curved and minutely pilose; filament sickle- 

 shaped with double dorsal membranous ridge. This is essen- 

 tially as in tahoensis. 



Larva (See Plate II). Lateral comb of the eighth segment 

 of about 36 scales, each scale with a row of apical spines. 

 Anal segment not ringed by the plate, which reaches only the 

 middle of the side and terminates in a ragged edge; lateral 

 hair single. Air-tube with the pecten evenly spaced, followed 

 by a 6-haired tuft. Head hairs single, long and stout, approxi- 

 mate ; ante-antenal tuft of nine. 



