334 THOMAS SAY FOUNDATION 



PLATE 22. 



Genitalia of Alloperla. 



Fig. 1. Alloperla novascotiana sp. now $, dorsal view. 



Fig. 2. Alloperla paeifiea Bks. $, dorso-lateral view. 



Fig. 3. Alloperla paeifiea Bks. 5 , ventral view. 



Fig. 4. Alloperla eoloradensis Bks. <$ , side view. 



Fig. 4a. Alloperla eoloradensis Bks. <$ , top view of supra-anal process. 



Fig. 5. Alloperla eoloradensis 9 , ventral view. 



Fig. 6. Alloperla albertensis sp. now $ . 



Fig. 7. Alloperla albertensis sp. now 9 > ventral view. 



Fig. 8. Alloperla lamha sp. nov. 9 > ventral view. 



Fig. 9. Alloperla lamia sp. nov. $ . 



Fig. 10. Alloperla ?narginata Bks. $ . 



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



Fig. 12. Alloperla pallidula Bks. $ , dorsal view. 



Fig. 13. Alloperla pallidula Bks. 9 , ventral view. 



