192 
231 
232 
233 
234 
THOMAS SAY FOUNDATION 
PLATE 34 
FIGURES 231-234 
Pteronarcys dorsata Say . 
Dark brown, sometimes striped; angles of pronotum not much 
produced; wing pads rather broadly rounded; abdominal segments 
without spines or hooks; antennae and cerci not banded with yellow. 
Pteronarcys biloba Newman 
Antennae and cerci with a yellow band near the middle; angles 
of pronotum quite sharp; hooks on abdominal segments large and 
directed away from body; cerci half or more than half as long as 
abdomen. 
Pteronarcys californica Newport 
Angles of pronotum produced into sharp processes; wing pads 
sharply pointed; abdominal segments smooth; antennae and cerci 
quite short and without lighter bands. 
Pteronarcys proteus Newman 
Angles of pronotum not produced; hooks on abdominal segments 
appressed; antennae and cerci with light bands near the middle; 
cerci less than half as long as abdomen. 
