178 WET GROUND COMMUNITIES 
develop in the place of one of the small ones with sandy bottom. Follow- 
ing dry seasons the temporary pond species are found in ponds which do 
not usually dry in summer, but which were dry the preceding summer. 
It has been shown that the eggs of Eubranchipus must be dried and 
Fic. 132.—The little smoky mosquito (Aedes fusca O.S.); much enlarged (from 
Williston after Smith): (1) adult female; (2) her palpus; (3) palpus of the male; 
(4) anterior; (5) middle, and (6) posterior claws of the male. 
frozen before they will hatch. The relation of their distribution, follow- 
ing the seasons of different rainfall, suggests that some definite degree 
of drying must be attained to insure hatching as well as that the eggs 
are probably blown about by wind. One autumn, about 1900, there was 
