448 
NORTH AMERICAN PLECOPTERA 
The last dorsal segment of the female narrow, elongated by the supra-anal 
plate, a long, straight, median, conical process (fig. 21). The supra-anal plate 
of the male broader and curved downward. The ninth sternite with a truncate 
prolongation extending over the tenth segment (fig. 20). 
We have material from several places; two nymphs from White 
Pigeon River, Michigan (A. S. Pearse) IV, 13, 1909; two from 
the Otter River, Baraga County, Michigan; nymphs and exu- 
viae from Elkhart, Indiana, IV, 1902; and exuviae from Un- 
gava Bay, Hudson Bay Territory (L, M. Turner), and from 
Harrisburg, Pennsylvania. 
Pteronarcys nobilis Hagen 
Adult 
1861. Pteronarcys nobilis Hagen, Syn. Neur. N. A., p. 15. 
1873. Pteronarcys nobilis Hagen, Proc. Host. Soc. N. H., 15: 285. 
1894. Pteronarcys nobilis Banks, Ent..News, 5: 178. 
1907. Pteronarcys nobilis Klap41ek, Bull. Internal. Acad. Sci. Boh6me, 
12, p. 4 of reprint. 
1873. Pteronarcys pictetii Hagen, Proc. Bost. Soc. N. H., 15: 286. 
1876. Pteronarcys pictetii Provancher, Le Nat. Can., 8: 191. 
1883. Pteronarcys pictetii Provancher, Pet. Faun. Can. N4urop., p. 70. 
1907. Pteronarcys pictetii Klapdlek, Bull. Internal. Acad. Sci. Boheme, 
12, p. 7 of reprint. 
1841. Pteronarcys proteus Pictet, Perlides, p. 128. 
?1842. Pteronarcys proteus Rambur, Hist. Nat. Ins. Neur., p. 449. 
Distribution . — New York; Tennessee; Kansas; Georgia; Penn- 
sylvania; Minnesota; Canada. 
cf . — Length to tip of wings, 31 to 34 mm.; setae, 12 mm.; expanse of wings, 
55 to 57 mm. 
9 . — Length to tip of wings, 45 to 48 mm. ; setae, 1 1 mm. ; expanse of wings, 
80 to 84 mm. 
Dark fuscous above and on appendages, orange beneath. Head about as 
wide as prothorax; the spots outside the ocellar triangle dark fuscous or black; 
supra-antennal plate very narrow. 
Prothorax a trifle broader posteriorly, sides straight, front margin slightly 
convex, hind margin decidedly arcuated, angles sharpened, a more or less con- 
spicuous, median, yellow line, broader at the ends. Wings smoky with dark 
veins. 
Abdomen w'ith a broad orange band beneath, the tip frequently shiny black, 
the tergites spotted laterally on the posterior margins with orange or rufous. 
Male. The ninth ventral segment elongate, ending in a broad notch, the 
sides of the notch straight; the tenth segment concealed below by the ninth, 
bifid above, its two lobes, elongate and appendage-like, a little shorter than 
