.'342 THOMAS SAY FOUNDATION 



PLATE 26. 



Genitalia of Isoperla. 



Fig. 1. Isoperla bellona Bks. $, dorsal view. 



Fig. 2. Isoperla bellona Bks. $ , 8th sternite. 



Fig. 3. Isoperla bellona Bks. $ , ventral view. 



Fig. 4. Isoperla fusca sp. nov. $ , penis extruded. 



Fig. 5. Isoperla fusca sp. nov. $ , 8th sternite. 



Fig. 6. Isoperla fusca sp. nov. 9 , ventral view. 



Fig. 7. Isoperla ^-punctata Bks. $ . 



Fig. 8. Isoperla ^-punctata Bks. $ , ventral view. 



Fig. 9. Isoperla bilineata Say $ , ventral view. 



Fig. 10. Isoperla bilineata Say $ , 8th sternite. 



Fig. 11. Isoperla 5 -punctata Bks. #, ventral view. 



Fig. 12. Isoperla bilineata Say $. 



Fig. 13. Isoperla ventralis Bks. $, 8th sternite. 



Fig. 14. Isoperla ventralis Bks. £ , dorsal view. 



Fig. 15. Isoperla longiseta Bks. $ , dorsal view. 



Fig. 16. Isoperla longiseta Bks. $ , 8th sternite. 



Fig. 17. Isoperla longiseta Bks. $, ventral view. 



