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 
Fic. 126.—The common marsh mosquito (Anopheles punctipennis 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), 
