Fig. 124. An adult may-fly with 

 caudal end. Enlarged eight times, 

 within the abdomen of the host. 



parasitic worm emerging from the 

 Xote the loop formed by the parasite 



Fig. 125. An association of caddis-worms in their cases, attached to a wet 

 rock. Four types of cases are shown on this overturned rock on the 

 margin of Lost Creek. Photo July 27. 



