102 Transactions of the Royal Canadian Institute 



The mesonotal markings run into impiger on the one hand and into 

 intrudejis on the other. It is a small species, like impiger. The winter 

 is passed in the egg state, the larvae developing in early spring pools. 

 The females bite both by day and night. The males swarm high over 

 spaces between bushes or small trees in open country. 



Distribution: Northern Rocky Mountains to Alaska, rare, if at all in 

 the east. 



Canadian Records. 



Banff, Alberta, July 7, 1918 (H. G. Dyar). 

 Laggan, Alberta, July 11, 1918 (H. G. Dyar). 

 Lake Minnewanka, Alberta, July 22, 19 18 (H. G. Dyar). 

 L^ake L,ouise, Alberta, July 11, 1918 (H. G. Dyar). 

 Field, British Cblumbia, August 15, 1906 (H. G. Dyar). 

 Mt. Cheam, British Columbia, August 7, — • — (J. Fletcher). 

 Wlhite Pass, British ColurtJDia, July 28, 1919 (H;. G. Dyar). 

 Atlin, British Columbia, July 22, 19 19 (H. G. Dyar). 

 Oarcross, Yukon Territory, June 26, 19 19 (H. G. Dyar). 

 Whitehorse, Yukon Territory, June 26, 1919 (H. G. Dyar). 

 Tahkeena R^ver, Ylikon Territory, July 19, 19 19 (H. G. Dyar). 

 Byer's Camp, Yukon Territory, July 6, 19 19 (H. G. Dyar). 

 Big Salmon,, Yukon Territory, July 15, 1919 (H. G. Dyar). 

 Carmack's, Yukon Territory, July 14, 19 19 (H. G. Dyar). 

 Horse Falls, Yukon Territry, July 13, 1919 (H. G. Dyar). 

 Knudson^'s Camp, Yukon Territory, July 6, 1919 (H. G. Dyar). 

 Tantalus Mine, Yukon Territory, July 6, 1919 (H. G. Dyar). 

 Selkirk, Yukon Territory, July 13, 1919 (Hi G. Dyar). 

 Dawson^, Yukon Territory, July 7, 19 19 (H,L G. Dyar). 



Group Canadensis. 

 Aedes (Heteronycha) canadensis Theobald. 



Culex canadensis Theobald, Mon. Culic, ii, 3, 1901. 



Culex nivitarsis Coquillett, Proc. Ent. Soc. Wash., vi, 168, 1904. 



A medium sized, dark brown mosquito, with conspicuously ringed 

 tarsi. Mesonotum dark brown, with more or less distinct paired n(arrow 

 light golden lines. Abdomen commonly unbanded dorsally, black, with 

 triangular white lateral spots at the basesof the segments; venter whitish 

 scaled. Legs black, the femora whitish beneath; tarsi with white rings 

 involving both ends of the joints, broader on the hind tarsi, the last hind 

 tarsal all white. Wing scales wholly da;rk. 



The winter is passed in the egg state, the larvae developing in tran- 



