30 



MISC. PUB. 601, U. S. DEPT. OF AGRICULTURE 



Figuke 19. — Plecoptera. Neoperla clymene (Newm.), a stoneily common east of 

 the Rocky Mountains. Actual length about 14 mm. 



Figube 20. — Ephemeroptera. Stenonema canadense (Walk.), a common Mayfly. 

 Actual length of body about 9 mm. 



