176 



WET GROUND COMMUNITIES 



of the ponds south of Lake Michigan, such ponds usually become grassy 

 in the middle and often typical temporary prairie ponds. Here we find 

 the green flatworm (Vortex), vernal planarians (Planaria velata), great 



y* 



Fig. 126. — The common marsh mosquito {Anopheles pnnctipennis Say); much 

 enlarged (from Williston after Smith). The details are such as to enable one to 

 recognize this species of mosquito: (1) adult female; (2) her palpus; (3) her genitalia; 

 (4) part of a wing- vein showing scales; (5) anterior, and (6) middle claws of the male. 



numbers of Entomostraca, belonging to all orders. Of the last there are 

 many very large cladocerans, the copepods (146) (Cyclops viridis 

 americanus) (Fig. 127), the red copepod (Diaptomus stagnalis) (Fig. 128), 



