The Mosquitoes of Canada 105 



paired quadrate spots; venter pale, with median row of black spots. The 

 pale scales on the abdomen vary, sometimes covering the whole surface. 

 Legs black, with white scales intermixed, femora white below; tarsi with 

 dull white rings at both ends of the joints. Wing scales dark and whitish, 

 rather evenly intermixed. 



The winter is passed in the egg state; the larvae occur in alkaline 

 pools with curriei. The males swarm after sunset close in the tops of 

 small pine trees. The females bite by day or njight, whenever one comes 

 into their haunts. 



Distribution: Utah and northward, very local, but usually abundant 

 where it occurs. 



Canadian Records. 



Charlton Inland, James Bay, July 19, 1918 (H. N. Awrey). 

 Oxbow, Saskatchewa^n, June 18, 1907 (F. Knab). 

 Qu'Appelle, Sa!skatchewan^ June 9, 1901 (T. N. Willing). 

 Carnduff, Saskatchewan, May 28, 1901 (T. N. Willing). 

 Regina, Saskatchewan, June 14, 1094 (T. N. Willing). 

 Kaslo, British Columbia, June 21, 1903 (H. G. Dyar). 

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



Group Stimulans. 

 Aedes (Heteronycha) stimulans Walker. 



Culex stimulans W/alker, List Dipt. Brit. Mus., i, 4, 1848. 

 Culicada siihcantans Felt, Bull. 97, N.Y. State Mus., 448, 1905. 

 Aedes mercurator Dyar, Ins. Ins. Mens., viii, 13, 1920. 

 Aedes stimulans alb ertae Dyar, Ins. Ins. Mens., viii, 115, 1920. 



A rather large brown mosquito with ringed legs. Mesonotum yellow- 

 ish gray on the sides, a broad reddish brown or dark brown band in the 

 middle, joining the short posterior stripes. Abdomen blackish, with basal 

 segmental white bands, widening on the sides, and- some white scales on 

 the alpices of the segments also; venter whitish, with a row of black 

 dashes on middle line. Legs black, with many white scales intermixed 

 on femora and tibiaJe, the tarsi with white rings at the bases of the joints, 

 broad on the hind pair. Wings with black scales, many white ones inter- 

 mixed, especially along costal region, but also on the other veins. In 

 the Yukon Valley, the wing scales are wholly black (form mercurator). 

 The form albertae shows larval differences. There are no reliable colour 

 difference between this and excrucians and fitchii. 



The winter is passed in the egg state, the larvae developing in spring 

 pools, especially those which have been overflowed by high water. The 

 males swarm after suriset over bushes, flying high and rapidly. This 



