452 
NORTH AMERICAN PLECOPTERA 
Pteronarcys proteus Newman 
Adult 
1838. Pteronarcys proteus Newman, Ent. Mag., 5; 177. 
1839. Pteronarcys proteus Newman, Mag. Nat. Hist., 3: 34. 
1861. Pteronarcys proteus Hagen, Syn. Neur. N. A., p. 14. 
1873. Pteronarcys proteus Hagen, Proc. Best. Soc. N. H., 15: 281. 
1894. Pteronarcys proteus Brongniart, Recherches sur I’Hist. des Insect. 
Foss., p. 186. 
1907. Pteronarcys proteus Klapdlek, Bull. Internal. Acad. Sci. Boh^me, 12, 
p. 7 of reprint. 
1906. Pteronarcys spinosa Banks, Proc. Ent. Soc. Wash., 8: 8. 
1907. Pteronarcys spinosa Klapdlek, Bull. Internal. Acad. Sci. Boh^me. 
12, p. 13 of reprint. 
Nymph 
1873. Pteronarcys proteus Hagen, Proc. Bost. Soc. N. H., 15: 283. 
Distribution . — Trenton Falls and Ithaca, New York; Macken- 
zie River District; North Red River; Hoosac Mountains, Massa- 
chusetts; Oregon; Vermont, and California? 
Adult 
ly. — Length to tip of wings, 33 mm.; length of antennae, 17 mm.; length 
of setae, 7 mm.; expanse of wings, 56 mm. 
9 . — Length to tip of wings, 40 mm.; length of antennae, 20 mm.; length of 
setae, 7 mm.; expanse of wdngs, 70 mm. 
Dark fuscous; head a little narrower than pro thorax; spots outside the 
ocellar triangle, rufous. Prothorax slightly widened posteriorly, sides and 
front border straight, hind margin convex, angles, right but not sharpened; a 
narrow, more or less obsolete, median, rufous line. Venter of thorax varied 
with testaceous. 
Male. The ninth ventral segment not produced, the sides with hollowed 
scars, the middle area narrow, sides almost straight; the ninth tergite with a 
horny, rounded projection pointing anteriorly. The tenth segment very 
narrow below, nearly covered by the ninth; bifid above with rounded lobes, 
on the opposed margins, close to the posterior border of the segment, promi- 
nent, flat, oval, horny areas. The sub-anal plates spoon-shaped, clasping the 
base of the supra-anal plate, which is modified into a slender, erect, probe- 
like organ (fig. 12). 
Female. The eighth ventral segment of this species is not triangularly 
produced as Newman described it, but it possesses a median sub-marginaj 
pair of spine-like processes extending half w^ay across the ninth segment (fig 
13). Bred specimens have led to the finding of the true female of this species 
Three males (one alcoholic) from Ithaca, New York, and four 
females, one from Hoosac Mountains, Massachusetts, and three 
(two alcoholic) from Ithaca. Both males and females of this 
