INSECUTOR INSCITI^ MENSTRUUS 35 



B. Frick on June 10, 1900 (communicated by Dr. C. S. Lud- 

 low). The species must be common there. The adults have 

 the partly bicolored veins of vinnipegensis; but this marking I 

 detect in eastern hirsutcron also, although perhaps it is not 

 quite so pronounced. The status of these forms must await 

 the discovery of males and larvcX for elucidation. 



Aedes trichurus Dyar. 



Culc.v trichurus Dyar, Journ. N. Y. Ent. Soc, xii, 170, 1904. 

 Culcx cincrcoborcalis Felt & Young, Science, n.s., xx, 312, 1904. 



Rather unexpectedly, this species was not met with. This 

 fact led to a reexamination of the specimens listed in the mono- 

 graph, where specimens are cited apparently continuing the 

 range throughout the Canadian region. White River, Ontario, 

 depends upon a single small female, which I consider to be 

 decticus, of the form without the black lines ; Aweme, Mani- 

 toba, depends upon a single large light gray female, which I 

 think is really trichurus; Banfif, Alberta, depends upon two 

 females which are quite normal prodotes; Kaslo, British Co- 

 lumbia, is the type locality for trichurus. I see in this an an- 

 alogy with hirsuteron as just described, namely an eastern and 

 a western form and an intermediate form in the wooded 

 prairies of Manitoba. Awcme is in southern Manitoba, south- 

 east of Brandon near the Assiniboine River and, although I 

 have not been there, I imagine the country is prairie with 

 patches of bush. Therefore the western trichurus should dif- 

 fer slightly from the eastern, especially in the larva. This 

 proves to be the case, the Kaslo form having about half as 

 many scales in the lateral comb as the New York form., which 

 I reared commonly at Plattsburg. The name trichurus Dyar 

 will apply to the western form, that of cincrcoborealis Felt & 

 Young to the eastern one, while I now suggest the name 

 roLiocHROS for the Manitoban form. The type of Aedes 

 poliochros, new species, is No. 31924, U. S. Nat. Mus., 

 Aweme, Manitoba, June 3, 1004 (N. Criddle). The specimen 

 is light gray, and I note no difference in the female from 

 cincrcoborealis F. & Y. The male and larva await discovery. 



