h 



INSECUTOR INSCITI^ MENSTRUUS 19 



Total, 91 specimens : Prince George, British Columbia, Sep- 

 tember 9, 1919; Terrace, British Columbia, August 11-14, 

 1919 ; Salvus, British Columbia, June 7-10, 13, 1919 ; Kwinitsa, 

 British Columbia, June 1, 4, 1919 ; Atlin, British Columbia, 

 July 33, 1919; White Horse, Yukon Territory, June 39, July 

 3, 4-7, 9, 11, 15, 1919 ; Horse Falls, Yukon Territory, July 13, 

 1919; Dawson, Yukon Territory, July 10, 11, 1919. 



Aedes varipalpus Coquillett. 



The species occurs in the southern part of the Canadian 

 region where suitable tree-holes are present, not in the spruce 

 forest. 



It was impossible to sit for more than a few minutes in the 

 woods at Terrace without a swarm of males forming close by 

 elbow or knee, attacking the females as these came to bite. 



Total, 40 specimens : Terrace, British Columbia, August 

 13-14, 1919. 



Culicella dyari Coquillett. 



The species extends throughout the Canadian region, though 

 always rare. 



Total, 3 specimens : Kwinitsa, British Columbia, June 10, 

 1919 ; White Horse, Yukon Territory, July 3, 1919. 



Culiseta impatiens Walker. 



The species occurs throughout the region and also in the 

 Coast Region. I give all the localities together. 



In the sandy flats at the mouth of the Skagway River, an 

 incipient race occurs. The size is distinctly smaller than nor- 

 mal, and the habits are divergent. The egg-boats are narrow 

 and long, as in incidens, not broad and rounded or triangular 

 as normally in the species, and are deposited in overflowed 

 pools in the sand and even in protected water-barrels, all quite 

 contrary to the usual sylvan habits of impatiens. However, I 

 could not demonstrate any positive differences. The divergent 

 habits have not yet been followed by structural change. 



Total, 330 specimens : Terrace, British Columbia, August 

 14, 17, 30, 33, 1919; Salvus, British Columbia, June 3, 1919; 



