100 Transactions of the Royal Canadian Institute 



or less black at the apices of the segments. Legs black, femora white 

 below; knee-spots white. Wing-scales all black. 



The colouration is not variable as far as observed ; but the species is 

 liable to be confused with large specimens of lazarensis. The winter is 

 passed in the egg state, the larvae developing in early pools in spruce 

 forest. The species is found only in the deepest forest or in northern 

 regions. The males swarm after sunset in openings in the forest. 



Distribution: Northern forests, presumably from Atlantic to Pacific, 

 although no far eastern records are available, but not in the moist 

 Pacific coast strip. 



Canadian Records, 



White River, Ontario, June 17, 1918 (H. G. Dyar). 

 Kenogami River, Ontario, June 30, 1903 (W. J. Wilson). 

 Prince Albert, Saskatchewan, August 14, 1918 (H. G. Dyar). 

 Red Deer, Alberta, July 30, 1918 (H. G. Dyar). 

 Lochearn, Alberta, August 5, 1918 (H. G. Dyar). 

 Lamoral, Alberta, August 6, 19 18 (Hl G. Dyar). 

 Lake Louise, Alberta, July 11, 1918 (H. G. Dyar). 

 Prince George, British Qolumbia, May 9, 1919 (H. G. Dyar). 

 Terrace, British Columbia, August 12, 19 19 (H. G. Dyar). 

 Kwinitsa, British Ciolumbia, May 25, 19 19 (H. G. Dyar). 

 Atlin, British Columbia, July 22, 1919 (H. G. Dyar). 

 Carcross, Yukon Territory, July 27, 1919 (H. G. Dyar). 

 Whitehorse, Yukon Territory, July 3, 1919 (H. G. Dyar). 

 HfOrse Falls, Yukon Territory, July 13, 1919 (H. G. Dyar). 

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



Aedes (Heteronycha) IxMpiger Walker. 



Culex impiger Walker, List Dipt. Brit. Mus., i, 6, 1848. 



Aedes decticus Howard, Dyar & Knab, Mosq. No. & Cent. Am. & W. L, 



iv, 737, 1917- 



A small blackish miosquito. Head gray, with or without black spots. 

 Mesonotum gray on the margins, more or less overspread with brown 

 centrally, and with two median blackish stripes and short posterior 

 lateral ones. Abdomen black, with rather broad basal segmental white 

 bands, usually not narrowed centrally; venter whitish, with apical black 

 segniiental bands. Legs black, somewhat mixed with white scales 

 especially below; femora white below. Wing-scales wholly dark. Palpi 

 of the male with few or no white scales. 



A description of the markings shows no difference from lazarensis; but 



