Notes on the Commoner Species 137 



all three species are quite frequently met with out-of- 

 doors during fall and winter, and will bite on warm 

 days. The young larvae were found as early as the 



Fig. 27. — Air tube and ninth segment of Anopheles crucians 

 larva, side view, greatly enlarged, showing only the branched hairs 

 of the near half. 



24th of February, but they cannot stand freezing, as 

 do those of some other genera. A number of young 

 AnopJicles larvae in jars in the laboratory were caused, 

 by a temperature of 32 F., to fall to the bottom of the 

 receptacles, where most of them died. A few, how- 

 ever, revived upon being warmed by the fire, having 

 remained in a cold and torpid condition under water 

 for many hours. 



The members of this ^enus hibernate in the adult 



