194 THOMAS SAY FOUNDATION 
PLATE 35 
FIGURES 235-238 
235 Pteronarcys biloba Newman 
Ventral view showing gills. 
236 Pteronarcys biloba Newman 
Young nymph. Note the light lateral margins of the thorax. 
237 Pteronarcys proteus Newman 
Ventral view. 
238 Pteronarcys princeps Banks 
Pronotum rather square; angles hardly produced; abdomen smooth; 
antennae aud cerci banded with yellow. Western. 
