320 THOMAS SAY FOUNDATION 



PLATE 15. 

 Wings of Perlidae. 



Fig. 1. Pelioperla brevis Bks. 



Fig. 2. Peltoperla thyra Ndm. & Sm. 



Fig. 3. Atoperla ephyre Newm. 



Fig. 4. Acroneuria georgiana Bks. 



Fig. 5. Peltoperla anna Ndm. & Sm. 



Fig. 6. Kathroperla pcrdita Bks. 



Fig. 7. Perlesta placida Hag. 



Fig. 8. Paraperla frontalis Bks. 



