330 THOMAS SAY FOUNDATION 



PLATE 20. 



Genitalia of Alloperla. 



Fig. 1. Alloperla imbe cilia Say $. 



Fig. 2. Alloperla imbecilla Say 9 , ventral view. 



Fig. 3. Alloperla nanina Bks. $ . 



Fig. 4. Alloperla nanina Bks. 9. 



Fig. 5. Alloperla signata Bks. 9. 



Fig. 6. Alloperla signata Bks. $, penis extruded. 



Fig. 7. Alloperla pilosa sp. now 5. 



Fig. 8. Alloperla pilosa sp. nov. $ supra-anal process fully extended. 



Fig. 9. Alloperla pilosa sp. nov. 9? ventral view. 



Fig. 10. Alloperla lineosa Bks. $, dorsal view. 



Fig. 11. Alloperla lineosa Bks. 9, ventral view. 



Fig. 12. Alloperla serrata sp. nov. $ , dorsal view. 



Fig. 13. Alloperla serrata sp. nov. 9, ventral view. 



