Figure 29. Adult Mayfly (Trioorythodes minutus). 



Capnia limata 

 Brachyptera fosketti 

 Brachyptera pacifica 

 Isogenus colubrinus 

 Isogenus elongatus 



Alloperla signata 

 Isoperla longiseta 

 Isogenus tos tonus 

 Isoperla patricia 

 Pteronarcys calif ornica 



Pteronarcella badia 

 Isoperla mormona 

 Alloperla pallidula 

 Claassenia sabulosa 



J J A 

 Sampling Months 



Figure 30. Emergence of stoneflies from the Yellowstone River, 1974-76. 



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