27 



svithout food, in a contined space of not more than 4 inches deep by 6 

 across, for three weeks. But one egg mass was deposited in confine- 

 ment. This was deposited on the morning of June 30 by a female which 

 issued from the pupa Juno 27. No further observations were made 

 upon the time elapsing between the emergence of the female and the 

 laying of the eggs, but in no case, probably, does it exceed a few days. 

 The length of time which elapses for a generation, which we have 

 just mentioned, is almost indefinitely enlarged if the weather be cool. 

 As a matter of fact, a long* spell of cool weather followed the issuing 



Fig. A.—Cule£ punoens : Female above, male below— enlarged (original). 



of the adults just mentioned. Larvae were watched for twent}^ days, 

 during which time they did not reach full growth. 



The extreme shortness of this June generation is significant. It 

 accounts for the fact that swarms of mosquitoes may develop upon 

 occasion in surface pools of rain water, which may dry up entirely in 

 the course of two weeks, or in a chance buc-ket of water left undis- 

 tur))ed for that length of time. Further, the shortness of this genera- 

 tion was, while not unexpected, not at all in accordance with any 



