72 MONTANA EXPEBMENT STATION Bui. 112 



Aedes syl-uestris Th. 

 Aedes sylvestris is second in importance only to Aedes curriei. 

 It occurs in about the same localities, but in our collecting sylvestris 

 has occurred in smaller numbers. 



Larval Records. — The earliest seasonal record of larvae is May 

 19 and the latest August 22. The length of the larval stage is about 

 the same as that of A. curriei and these two species have been 

 taken repeatedly from the same pool. 



Larvae have been found in the following situations : ''Tempo- 

 rary pool in town," "pool formed by overflow of irrigation water," 

 "small rather permanent pools," "waste irrigation water," "pool in 

 edge of alfalfa field," "temporary pool caused by spring rains," 

 "temporary roadside pool," "temporary pool caused by summer 

 rains." 



Record of Adults. — Our earliest seasonal record of adults is 

 June 4 and our latest August 29. The adults are bad biters both 

 day and night. 



Adults have been found in practically the same situations as 

 recorded for A. curriei. 



Distribution. — This species has been taken in the following 

 localities : Harlem, Chinook, Turner, Miles City, Forsyth, Billings, 

 Laurel, Huntley, Hardin, Bozeman, Three Forks, Lombard, Dillon, 

 Cascade and Florence. 



Aedes nigromaculis Lud. 



This species is a bad biter and occurs in abundance in some 

 localities, but is not as widely distributed nor as abundant as the 

 two species already discussed. 



Larval Records. — The only records of larvae are as follows : 

 "Temporary overflow from irrigation ditch," August 28 ; "temporary, 

 muddy roadside pool," August 14; "temporary pool in town," 

 August 8. 



Record of Adults. — The first seasonal record of adults is June 

 4 and the last September 5. 



Adults have been taken in the following situations: "Edge of 

 slough," "grass above temporary pool," "alfalfa field," "along road," 

 "prairie grass," "at light in towns," "blue-joint meadow," "river 

 valley," "near stock yards," "in grass above pool which had dried 

 out/ 



