i 7 8 



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 



Fig. 132. — The little smoky mosquito (Aedes fitsca 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 



