118 FIFTH REPORT OF THE ENTOMOLOGICAL COMMISSION. 
Fig. 37. -Forest tent-caterpillar; 6, female moth ; c, d, eggs 
of the forest tout-caterpillar. (After Riley.) 
segment On the hinder p«rt of enofa wing are three crinkled and more or less pale, 
orange-yellow lines, which are edged with black. On ea.h tide also is a continuous 
andsonie what broader stripe of 
the same yellow color, similarly 
edged on each side with black. 
Lower down on each side of the 
body is a paler yellow or cream- 
colored stripe, the edges of which 
are more jagged and irregular 
than those of the one above it. 
Length 1.50 inches. (Fitch.) 
The male moth usually measures 
1.20 across its spread wings. Its 
thorax is densely coated with soft 
hairs of a nankin-yellow color. 
Its abdomen is covered with 
shorter hairs, which are light um- 
ber or cinnamon brown on the 
back and tip and paler or nankin- 
yellow on the sides. Theantenine 
are gray, freckled with brown 
scales, and their branches are very 
dark brown. The face is brown with the tips of the feelers pale gray. The fore 
■wings are gray, varied more or less with nankin yellow, and they are divided into 
three nearly equal portions by two straight, dark-brown lines, which cross them 
obliquely, parallel with each other and with the hind margin. The space between 
these lines is usually brownish and darker than the rest of the wing, being quite often 
of the same dark-brown color as the lines, whereby they become wholly lost. Some- 
times the hind stripe is perceptibly margined on its hind side by a pale-yellowish line. 
The fringe is of the same dark-brown color with the oblique lines, with two whitish 
alternations toward its outer end. But sometimes it is of the same color with the 
wings and edged along its tips with whitish. The hind wings are of a uniform pale 
umber or cinnamon brown, sometimes broadly grayish on the outer margin, and across 
their middle a faint darker brown band is usually perceptible, its edges on each side 
indefinite. The fringe is of the same color with the wings or slightly darker and is 
tipped with whitish. The under side is paler umber brown, the hind wings often gray, 
and both pairs are sometimes crossed by a narrow dark-brown baud, which on the 
hind wings are curved outside of the middle. All back of this band on both wings 
is often paler, aud more so near the baud. 
The female is 1.75 in width, and, in addition to the shortness of the branches of her 
antennae, differs from the male in her fore wings, which are proportionally narrower 
and longer, with their hind margin cut off more obliquely and slightly wavy along its 
edge. Hence, also, the dark-brown lines cross the wings more obliquely, the hind one 
in particular forming a much more acute augle with the outer margin. And all the 
wing back of this line is sometimes paler or of a brownish-ashy color. And the fringe 
of these wings has not the two whitish alternations which are often so conspicuous 
in the male. The head aud forepart of the thorax is cinnamon brown. The abdomen 
is black, clothed with brown hairs, though very thinly so on the anterior part of each 
segment, where these hairs are intermingled with silvery gray scales. (Fitch.)* 
*Tbe following references are copied from Mrs. A. K. Dimmock's Insects of Betula, 
in Psyche, iv, 275: 
Clisiocampa sylvatica Harris (Rept. Ins. Injur. Veg., 1841, pp. 271-272) [= C. disstria 
Hiibn.]. Harris (op. cit., p. 272) describes the larva of this species, giving as food- 
plants Quercus, Juglans, and apple; later (Treatise on Ius. Injur. Veg., 1362, pp. 
375-376., pi. 7, tigs. 18, 19) he repeats the description and adds a colored figure of the 
larva and imago, adding wild cherry to the food-plants; again he describes (Entom. 
