September, 1942 
by Pictet (1841) and is in the Zoological 
Museum, Berlin, Germany. Pictet’s speci- 
men may be in the Zoological Museum in 
Berlin, but the types of pictetii are in the 
Museum of Comparative Zoology, as al- 
ready stated. 
Pteronarcys species 
In New Brunswick in 1939, a series of 
nymphs of Pteronarcys was taken which 
cannot be reliably assigned to any species 
known at this time. Since then a similar 
nymph has been collected in Connecticut. 
The nymph, fig. 2, because of lateral pro- 
jections on the sides of the first eight ab- 
dominal segments, is suggestive of the 
nymph at present associated with the spe- 
cies biloba Newman and proteus New- 
man. Of these two species it most closely 
resembles the nymph now assigned to bilo- 
ba because of the more prominent lateral 
lobes and the more sharply angled anterior 
corners of the pronotum. It differs from 
i, I 
t 
tod 
% 
woke 
Fig. 2—Nymph of Pteronarcys species. 
Frison: NortH AMERICAN PLECOPTERA 
245 
biloba, however, in that the lateral ab- 
dominal projections are much more devel- 
oped except on the first and eighth seg- 
ments, that there is a very prominent pro- 
jection on each side of the mesonotal wing 
pad, and that the projections at the corner 
angles of the pronotum are abnormally 
prominent. 
There is considerable question as yet 
regarding the true status of Pteronarcys 
comstockt Smith, and it is possible that 
the nymph now illustrated should be asso- 
ciated with this name. Reared material is 
needed to settle this and other points in- 
volved with the correct determination of 
several species of Pteronarcys. 
Data associated with these specimens are 
as follows. 
ConNeEcTIcUT.—MounT CarMEL, Mill River, 
Sleeping Giant State Park: Oct. 1451941) Kk. 
M. Sommerman, 1 nymph. 
NEW Brunswick.—PENossQuls, crawling on 
rocks in small clear stream: Aug. 20, 1939, 
T. H. Frison & T. H. Frison, Jr., 18 nymphs, 
PELTOPERLIDAE 
This family is exceedingly interesting 
to the student of stoneflies because of its 
many unique features, including the strik- 
ingly roachlike appearance of the nymphs. 
Fig. 3.—Nymph of Peltoperla brevis, 
