26 INSECUTOR INSCITI^ MENSTRUUS 



Clearly this represents one of the fitchii group. I have se- 

 lected abHtchii as the most abundant and dominant species and 

 therefore most likely to have been before Walker. 



This species occurs throughout our area and extends out- 

 side of it, in the east as far south as New Jersey. Its westward 

 limits are not yet known. Adult females tend to be larger than 

 fitchii and have less of white scales on the wings, but the dif- 

 ference is far from being diagnostic. 



Males were seen swarming at Banff. They fly shortly after 

 sunset in small swarms, very high in openings in the woods, 

 roads, or the tops of smaller trees. The swarms are loose and 

 open, clustering for a few seconds in one spot, then dashing 

 away to a distance. The swarming period does not seem to 

 exceed half an hour. 



Males were demonstrated from the following localities : 

 White River, Ontario (F. Knab, 1907) ; Dryden, Ontario, Red 

 Deer and Banff, Alberta (Dyar, 1918). 



Aedes fitchii Felt & Young. 



Culex fitchii Felt & Young, Science, n.s., xx, 312, 1904. 



Males were observed swarming at Banff. They fly in small 

 groups, after sunset, high in openings in the forest, much as 

 with excriicians, though they seem less wild and flighty. The 

 smaller appearance of the specimens is noticeable. 



Specimens recorded by me as mimesis from Aweme, Mani- 

 toba, June 13-July 10, 1910 (N. Criddle) (Ins. Ins. Menstr., v, 

 116, 1917), should be referred here. 



Males were demonstrated from the following localities : 

 White River, Ontario (F. Knab. 1907) ; Dryden, Ontario 

 (Dyar, 1918) ; Winnipeg, Manitoba (Knab, 1907) ; Banff, Al- 

 berta (Dyar, 1918). 



Unassorted specimens of cxcrucians and fitchii were taken in 

 1,370 examples, as follows: White River, Ontario, June 

 15-25, 1918; Nipigon, Ontario, June 26, 1918; Dryden, On- 

 tario, June 27-July 2, 1918; Kenora, Ontario. July 2. 1918; 

 Winnipeg Beach, Manitoba, July 4-5, 1918; Saskatoon, Sas- 

 katchewan, August 10-20. 1918; Prince Albert. Saskatchewan, 



