302 THOMAS SAY FOUNDATION 



PLATE 6. 



Eggs of Plecoptera. 



Perla media Walk., lateral view of egg. 



Perla media Walk., lateral view of egg, cap extended. 



Perla media Walk., a detail of the surface of same. 



Perla sp.? (Los Angeles, Calif.). 



Perla sp.? Another view. 



Acroneuria lycqrias Newm., lateral view of egg. 



Acroneuria lycorias Newm., lateral view of egg, with cap 



everted. 

 Perlodes sp. ? (Wyoming). 

 Capnella vivipara Clsn., soft-shelled egg from ovary, containing 



embryo. 

 Anacroneuria sp.? (from Argentina). 

 Neoperla clymene Newm., lateral view of egg. 

 Neoperla sp.? detail of lower end of same. 

 Perla various Walsh, lateral view of egg. 

 Perla varians Walsh, diagram of cross-section of same. 

 Drawings by Miss Theresa McConnell. 



