Plate IIIA 



Fig-. 1. Flowers of the swamp milkweed {Asrlcpias iiicarnata) at Station I, d. These were the 

 favoiite haunts of manv flower-visiting- insects. (Photograph, T. L. Hankinson.) 



Fig-. 2. Crawfish chimney at Station I, i/, Charleston. III. Probably formed bv Cambarus gracilis 

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



