74 INSECUTOR INSCITI^ MENSTRUUS 



A'edes hexodontus Dyar, Ins. Ins. Mens., viii, 23, 1920. 

 Aedes hexodontus Dyar, Ins. Ins. Mens., viii, 168, 1920. 



The spine on the basal lobe of the male hypopygium is dis- 

 tinctly stout, the structure being practically inseparable from 

 that of the European form. The present species, however, is 

 confined to the mountains of California and Oregon, breeding 

 in open shallow pools in spring. The winter is passed in the 

 egg state. The coloration of the adults is variable, tending to 

 brown or yellow suffused forms, rarely distinctly marked with 

 two brown lines. This differs from the European nemorosus 

 Auct., which is of the punctor type, the mesonotum yellow 

 with broad central dark band. 



Species 5 



Aedes (Ochlerotatus) leuconotips Dyar. 



Aedes leuconotips Dyar, Ins. Ins. Mens., viii, 24, 1920. 

 The spine of the basal lobe of the side-piece of the male 

 hypopygium is very stout, and there is no marked differentia- 

 tion from hexodontus. The coloration of the adult is as in 

 ahoriginis, but the species is not as large. The larvae breed 

 early in muskeg-pools in the moist coastal strip from British 

 Columbia to Alaska. The larvae agree structurally with both 

 hexodontus and punctor; but the breeding pools are of a very 

 different character, and the species appears to be distinct. 



Species 6 



Aedes (Ochlerotatus) cyclocerculus Dyar. 



Aedes cyclocerculus Dyar, Ins. Ins. Mens., viii, 23, 1920. 

 In male genitalia and structure of larva indistinguishable 

 from leuconotips. The larvae inhabit muskeg-pools in the same 

 region ; but the species is smaller, the coloration of the adults 

 different, and the larvae darker and more gregarious. This is 

 the commonest species in virgin forest on the coast of British 

 Columbia and Alaska. The mesonotum is generally marked 

 with dark side-stripes, the middle stripe more or less obsolete, 

 which gives a unique appearance. Nevertheless, cyclocerculus 

 and leuconotips may be varieties of one species. Further ex- 

 perience with these forms is desirable. 



