Platij IIIA 



Fiff. 1. Flowers of the swamp milkweed {AscLpias iiicarnata) at Station I, d. These were the 

 favoiitc haunts of many flower-visitingr insects. (Photograph, T. L. Hankinson.) 



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^^•'i^ 

 .-^^^r^ -.->•,. 



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Fig-. 2. Crawfish chimney at Station I, d^ Charleston, 111. Probably formed by Cambaru^ gracilis 

 or diogenes. (Photograph by T. L. Hankinson.) 



