74 MONTANA EXPERIMENT STATION Bui. 112 



much economic importance : A. canvpestris D & R, A. fletcheri Coq., 

 A. stimulans (group), A. idahoensis Th., A. hirsuteron, and A. 

 fuscus O. S. 



MOSQUITOES OF THE GENUS CULISETA 



To this genus belong several species of Montana mosquitoes. 

 Although they are biters, they seldom occur in such numbers as 

 to be annoying. Unlike the Aedes, these species pass the winter 

 as the adult and the eggs are laid directly in the water in more or 

 less permanent pools. 



We have collected Culiseta larvae in the following situations. 

 "Cat-tail swamp," "alkali pool near swamp," '"permanent swamp," 

 "swamp along railroad," "irrigation overflow," "horse track filled 

 with irrigation water." 



Four species have been found, namely, Culiseta inornatus Wil- 

 liston, C. incidens Thompson, C. inpatiens Walker and C. alasha- 

 ensis Lind. The two most common species are inpatiens and 

 inornatus. 



MOSQUITOES OF THE GENUS CULEX 



Only two species in this large group have been found in Mon- 

 tana, namely, C. tarsalis Coq. and C. territans Walk. Culex species 

 are continuous breeders, that is, eggs are deposited directly in the 

 water and hatch the same season. More or less permanent pools 

 are the typical breeding places. 



Culex tarsalis Coq. 



This is by far the more abundant of the Culex species found 

 in Montana. 



Larval Records. — Our earliest seasonal record for larvae is June 

 22 and the latest August 28. 



Larvae have been taken in the following situations : "Roadside 

 pool," "small permanent pool," "cat-tail pool," "horse tracks in 

 permanent swampy ground," "deep water in cat-tail swamp." "alkali 

 pools near swamp," "permanent swamp along railroad," "water 

 from irrigations," "pools formed by June rains in marshy ground." 



Record of Adults. — Our only capture of adults was made by 

 Dr. R. R. Parker at Laurel in 1914. In connection with a study 

 of house-fly conditions, Hodge fly traps were placed so as to capture 

 all the insects that escaped from the rear of a privy, the door of 



