116 THOMAS SAY FOUNDATION 
Allocapnia mystica Frison 
The following description of this nymph is taken from Frison 
(6). Nymphal male.—Similar in general form, color, and struc- 
ture to A. vivipara. Wing pads conspicuous, fore wing pads over- 
lapping base of hind wing pad. Dorsal lobe-like protuberance at 
apex of abdomen nearly twice as long from base of anal cerei to 
apex as length of ninth dorsal segment. 
Nymphal female.—Differs from male in being somewhat larger 
and with apex of abdomen rounded and not with a long protuber- 
ance. In some specimens an indication of the projection on the 
posterior margin of the eighth ventral abdominal segment may be 
seen through the integument. 
This species has thus far been found only in Illinois. 
