470 
NORTH AMERICAN PLECOPTERA 
Protarcys bradleyi new species 
Adult 
Distribution . — Canadian Rocky Mountains. 
cf . — Length to tip of wings, 20 mm.; length of antennae, 12 mm.; expanse 
of wings, 32 mm. 
9. — Length to tip of wings, 23 mm.; length of antennae, 12 mm.; length 
of setae, 7 mm.; expanse of wings, 37 mm. 
Dark brown varied with golden brown and yellow. Head triangular, three 
moderately large ocelli arranged in an isosceles triangle, the distance between 
the lateral ocelli one-third greater than the distance from them to the median 
ocellus and very nearly as great as the distance from them to the inner margin 
of the eye. The M-shaped mark yellow-brown, glossy, conspicuous; tubercles 
shiny reddish-brown, in the form of crescents, the distance from them to the 
posterior ocelli half as great as the distance from them to the inner margin of 
the eyes. . Labrum whitish; clypeus with a yellowish brown, median area and 
a pale yellow spot toward either anterior corner; a yellow-brown, inverted 
V-shaped mark passing from the median ocellus backward to the posterior 
ones; crown suture deep, pale yellow; a large, median, pale yelloy^, occipital 
spot which extends laterally in a narrow band along the entire occipital border; 
the lateral areas of the occiput with rather fine, dark brown sculpturings. 
Antennae, long, slender, over half the length of the body, the basal segment 
dark brown, in the male the second and third segments pale and the remainder 
dark brown, in the female the entire antenna pale brown with the exception 
of the dark basal segment. Under side of head pale yellow; palpi, white. 
Pronotum trapezoidal, anterior border wider than posterior but narrower 
than the occiput; sides and hind margin straight, front margin a little arcu- 
ated, corners squarish; a very dark brown band along the anterior border in- 
terrupted in the middle by a median yellow band, moderately broad and 
dilated posteriorly; the lateral areas darkest in the outer half, coarse, yel- 
lowish brown sculpturings in the inner part. Meso- and metanotum dark 
brown with pale median bands. The entire venter of the thorax yellowish 
white, with a more or less rectangular dark browm spot toward the middle of 
each of the three segments. Legs yellowish brown, the distal half of the 
femora, a band below the knees, the tip of tibiae and the tarsi, darker. Wings 
yellowish brown, venation rather dark, veins somewhat clouded; an irregular 
network of cross-veins in the tip of the wing, extending from costa through 
cubitus, the cross-veins fewer in the median and cubital fields, but not entirely 
lacking (fig. 60) . Three pairs of white, fleshy, tracheal gills in the form of short, 
slender blind sacs situated as follows: one pair (small and inconspicuous) far 
apart on the lateral margin of the submentum, and a pair each on the anterior 
post-marginal border of the meso- and metasternum on a line with the lateral 
posterior border of the base of the legs. 
Abdomen dark brown above with a median pair of narrow paler stripes, con- 
spicuous on the basal segments but gradually becoming fainter toward the tip 
and disappearing in the male on the fifth segment and in the female on the 
