59* 



FRESH-WATER BIOLOGY 



FIG. 886. Salpina spinigera Ehr. X 200. 

 (After Weber.) 



FIG. 888. Diplois daviesiae FIG. 889. Diplax miens 

 Gosse. X 87. (After Levander. X 267. (After 

 Weber.) Lucks.) 



FIG. 887. Diaschiza hoodii Gosse. 

 ,4, Female. B, Male. X 300. 

 (After Dixon-Nuttall and Free- 

 man.) 



FIG. 890. Distylainermis Bryce. A, Dorsal view; B, con- 

 tracted; C, side view. X 225. (After Dixon-Nuttall.) 



FIG. 89 1 . Distyla ohioensis Herrick . 

 X 420. (After Jennings.) 



