PLATE XI. 



FIG. 17. Ovisac of B. Lindahli with eggs. X -4- 



FIG. 1 8. Ovisac of B. coloradcnsis with eggs. X 2 4- 



FIG. 19. Caudal appendages of male of B. coloradensis. X 2I - 



FIG. 20. Caudal appendages of female of B. coloradensis. X 2I - 



FIG. 21. Caudal appendages of male of B. Lindahli. X 21. 



FlG 22. Caudal appendages of female of B. Lindahli. X 2I - 



FlG. 23. Head of male of B. coloradensis, front view. < 14. 



FIG. 24. Head of male of B. Lindahli, front view. / 14. 



262 



