340 THOMAS SAY FOUNDATION 



PLATE 25. 



Genitalia of Clioperla, Perla and Isoperla. 



Fig. 1. Clioperla ebria Hag. 9 , ventral view. 



Fig. 2. Clioperla ebria Hag. $ , dorsal view. 



Fig. 3. Clioperla ebria Hag. $ , ventral view. 



Fig. 4. Clioperla clio Newm. $ , ventral view. 



Fig. 5. Clioperla clio Newm. 9 , ventral view. 



Fig. 6. Clioperla clio Newm. $ , dorsal view. 



Fig. 7. Clioperla gravitans sp. nov. $ , dorsal view. 



Fig. 8. Clioperla gravitans sp. nov. $ , ventral view. 



Fig. 9. Clioperla sobria Hag. $ , ventral view. 



Fig. 10. Perla sorpta sp. nov. 9, ventral view. 



Fig. 11. Clioperla marmorata sp. nov. $, ventral view. 



Fig. 12. Isoperla marlynia sp. nov. $, ventral view. 



Fig. 13. Isoperla marlynia sp. nov. $ , dorsal view. 



Fig. 14. Isoperla marlynia sp. nov. 9 , ventral view. 



Fig. 15. Perla obscura sp. nov. 9 , ventral view. 



