346 
FEMALE. — Head, thorax, basal seg- 
ments of abdomen and appendages in gen- 
eral similar to those as described for the 
male (Needham & Claassen 1925), except 
general color is more brownish. Important 
differences are as follows: eighth abdom- 
inal sternite, fig. 125, with posterior mar- 
Fig: 125:— 
Alloperla 
novascotiana. 
tet 
Q SUBGENITAL PLATE 
gin produced backwards over ninth ster- 
nite, its tip somewhat truncate. 
Allotype, female—Essex County, Artist’s 
Brook, N. Y.: June 23, 1940, H. D. Dietrich. 
New records for this species are as follows. 
New York.—Coitp Broox: June 30, 1940, 
H. Dietrich, 19. Essex COUNTY, Artist’s 
Brook: June 23, 1940, H. Dietrich, Shel Oe 
Mount Marcy: June 29, 1940, H. Dietrich, 
Tesi aes 
PENNSYLVANIA.—SWIETWATER, Monroe Coun- 
ty: 1928, F. R. Nevin, Lot 258, Den 
Alloperla fidelis Banks 
Alloperla fidelis Banks (1920, p. 323). Orig- 
inal description, 2. 
It seems desirable to record here a series 
of adults with brachypterous wings, both 
males and females, which are apparently 
of the species fidelis. The only difterences 
noted between the typical fidelis and these 
specimens are the smaller average size, the 
short wings in both sexes, a slight differ- 
ence in shape of the indention on the pos- 
terior margin of the subgenital plate in 
the female, and the somewhat narrower 
supra-anal process of the male. ‘These are 
the first specimens of 4/loperla I have ever 
seen which were brachypterous, but Ricker 
(1939) has recorded brachypterous forms 
of the same species from small creeks at 
high elevations in British Columbia. It is 
of interest to note that both sexes in these 
specimens are short winged, whereas in 
many species of stoneflies this condition 
occurs or is reported to occur only in the 
males. 
The specimens have the following data. 
WYOMING.—DUNRAVEN Pass, Mount Wash- 
burn, Yellowstone National Parkt Auge: 
ItLinois NATURAL HIsToRY SurvVEY BULLETIN 
V ol, 22904 rhe 
1940, T. H. Frison & T. H. Frison,) Jr nore 
32a 
In fig. 126 are illustrations of these 
specimens as follows: dorsum of male 
abdomen, lateral view of male terminal | 
ADULT HEAD 
AND PRONOTUM 
SuPRA- 
ANAL 
PROCESS 
Si 2) 
Q SUBGENITAL PLATE 
G ABDOMINAL 
TERGITES 
3! ABDOMINAL SEGMENTS 
Fig. 126.—Alloperla fidelis. 
abdominal segments, supra-anal process of 
male, subgenital plate of female, and head 
and pronotum. 
Alloperla pallidula (Banks) 
Chloroperla pallidula Banks (1904, p. 99% 
Original description, 2. 
Alloperla dubia Frison (19350, p. 338). 
Original description, 6, °. New synonymy. 
In 1935, I described dubia as a new 
species closely related to pallidula and 
differing from it in having a median, 
longitudinal, dorsal, dark stripe on the 
abdomen. Although Needham & Claas- 
sen (1925) had treated pallidula as a 
species with this dark stripe, I had dis- 
regarded their concept of this species be- 
cause of information from Dr. Nathan 
Banks that pallidula did not have such a 
stripe, and there was no indication in the 
original description of such a stripe on 
the typic specimen. 
