318 THOMAS SAY FOUNDATION 



PLATE 14. 

 Wings of Perlidae. 



Fig. 1. Alloperla borealis Bks. 



Fig. 2. Isoperla bilineata Say. 



Fig. 3. Perla tincta sp no v. 



Fig. 4. Alloperla lamia sp. nov. 



Fig. 5. Perla aestivalis sp. nov. 



Fig. 6. Chloroperla cydip'pe Newm. 



Fig. 7. Perla bilobata sp. nov. 



Fig. 8. Perla verticalis Bks. 



