300 THOMAS SAY FOUNDATION 



PLATE 5. 



Eggs of Plecoptera. 



Ptcronarcys dorsata Say, lateral view. 



Pteronarcys dorsata Say, lateral view. 



Pteronarcys dorsata Say, cap. 



Pteronarcys dorsata Say, top view. 



Pcltopcrla arcuata Ndm., lateral view. 



PeltoperJa arcuata Ndm., minute structure, a detail of the 



surface. 

 1 so genus colubrinus Hag. 

 Isogenus frontalis Newm. 

 Perla expansa Bks. 



Pteronarcella regularis Hag., lateral view. 

 Pteronarcella regularis Hag., cap from under side. 

 Isoperla bilineata Say, lateral view. 



Isoperla bilineata Say, minute structure, a detail of the surface. 

 Perlinella drymo Newm., lateral view. 

 Perlinella drymo Newm., lateral view of cap. 

 Perlinella drymo Newm., top view of cap. 

 Drawings by Miss Theresa McConnell. 



