1922] Matheson and Shannon: Mosquito Records 159 



last larval skin, pupal skin and adult, was also found in student 

 material collected in swampy, grassy pools at Ringwood, N. Y., 

 on May 10, 1921. This location is about six miles from the 

 McLean habitat. 



Aedes canadensis Theob. 



This is one of the most common species of mosquitoes 

 about Ithaca. It is generally believed that there is but a 

 single generation each season, the overwintering eggs hatching 

 at irregular intervals during the summer. Their normal 

 habitat is woodland pools of a temporary character. The 

 following observations would tend to show that there are more 

 than one annual generation. 



In our attempts to secure the larvae of what proved to be 

 Culicella dyari, we made two artificial pools on July 1st, in 

 the sphagnum bogs at McLean. These pools were about 

 18 inches square and the water was from 10 to 15 feet deep. 

 These bogs were dry on the surface when the openings were 

 made. About 10 days later we found in these pools young 

 larvae which were remarkable on account of their blackish 

 color. On July 18, nearly mature larvae were found. These 

 proved to be A. canadensis, not the unknown mosquito 

 {Culicella dyari) as we had hoped. This would appear a new 

 habitat for this species. The dark color of the larvae was no 

 doubt due to the decaying sphagnum which was eaten for food. 

 The appearance of the species in these freshly made pools 

 would seem to indicate that eggs were undoubtedly laid during 

 mid-summer and hatched the same season. 



The genus Aedes. Group stimulans. 



Dyar (1920) has divided the genus Aedes into a number 

 of groups, one of which is the stimulans group. During the 

 past spring we made observations on three closely related 

 species of Aedes — A. stimulans Walker, A. excrucians Walker 

 {abfitchii F. & Y.) and A. fitchii F. and Y., all belonging to 

 the stimulans group. Furthermore, Dyar considers each one 

 of these to represent typically the three series into which 

 he divides the stimulans group and around each are placed the 

 known North American species according to their relationships. 



While collecting larvae on April 19, in the Renwick flats, 

 at the head of Cayuga Lake, a single larva of A. stimulans 



