104 Transactions of the Royal Canadian Institute 



on the lateral margins. Aibdomen with grayish white basal segmental 

 bands and a longitudinal mid-dorsal line, cutting the black ground into 

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

 The pale scales on the abdomen vary, sometimes covering the whole 

 surface. I^egs black, with white scales intermixed, femora white below; 

 tarsi with dull white rings at both ends of the joints. Wiing-scales dark 

 and whitish, rather evenly intermixed, though the third vein is pre- 

 dominatingly dark. 



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

 ground puddles. The males swarm after sunset over prominent objects 

 on the prairie. The females are persistent biters, especially abundant 

 after sunset. 



Distribution: Dry, open country and prairie, central United States 

 to Canada, also as a salt-marsh breeder on the coasts of the Atlantic, 

 Pacific and Hlidson's Bay. 



Canadian Records. 



Moose Factory, Qntario, July 26, 1918 (H. N, Awrey). 

 Winnipeg Beach, Manitoba, July 4, 19 18 (H. G. Dyar), 

 Wyniyard, Saskatchewan, Ajugust 13, 1918 (H. G. Dyar). 

 Saskatoon, Saskatchewan, August 13, 1918 (H. G. Dyar). 

 Qu'Appelle, Saskatchewan, June 22, 1907 (T. N. Willing). 

 Oxbow, Saskatchewan, May 21, 1907 (F. Knab). 

 Carndulif, Saskatchewan, May 27, 1907 (F. Knab). 

 Banfif, Alberta, July 8, 1918 (H. G. Dyar). 



Vancouver, British Columbia, A'ugust 6, 1906 (Dyar & Caudell). 

 Qualicum, British Columbia, July 20, 1903 (J. Fletcher). 

 Duncans, British Columbia, August 8, 1906 (Dyar & Caudell). 

 Nanoose B^y, British Cblumbia, August i, 1903 (J. Fletcher). 

 Caulfields, British Columbia, May 3, 1919 (E'. Hearle). 

 Buccaneer Bay, British Columbia, August 24, 1919 (E. Hearle). 

 Victoria, British Columbia, August 29, 1919 (E. Hearle). 



Aedes (H,eteronycha) campestris Dyar & Knab. 



Aedes campestris Dyar & Knab, Journ, N.Y. Ent. Soc, xv, 213, 1907. 

 Aedes callithotrys Dyar, Ins. Ins., Mens., viii, 16, 1920. 



A rather large, yellowish gray mosquito, the tarsi banded with white, 

 but sometimes very inconspicuously. Mesonotum creamy yellowish, 

 a diffused brown stripe in the middle of variable width, alnd a little brown 

 on the lateral margins. Abdomen with grayish white basal segmental 

 bands, and a longitudinal mid-dorsal line, cutting the black ground into 



