146 THOMAS SAY FOUNDATION 
PLATE 11 
FIGURES 169-176 
169-170 Pteronarcys proteus Newm. 
169. Terminal segments of male nymph 
170. Terminal segments of female nymph 
171-172 Pteronarcys biloba Newm. 
171. Male 
172. Female 
173-174 Pteronarcys dorsata Say. 
173. Male 
174, Female 
175-176 Pteronarcys californica Newpt. 
175. Male 
176. Female 
