27 
without food, in a confined 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 June 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. 
Asamatter of fact, a long spell of cool weather followed the issuing 
ie. 
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Fic. 4.—Culex pungens; Female above, male below—enlarged (original). 
of the adults just mentioned. Larve were watched for twenty 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 bucket of water left undis- 
turbed for that length of time. Further, the shortness of this genera- 
tion was, while not unexpected, not at all in accordance with any 
