120 FIFTH REPORT OF THE ENTOMOLOGICAL COMMISSION. 
The larva' ;irc about 2 inches lonir, of a velvety, blackish-brown color, and are cov- 
ered with quite long yellowish-brown hairs. They are feeding on oak. 
The larva- changed to pupae April 21, and the moths issued May lb. 
Larva), papa aud eggs were also received in July, 1884, from H. Bliss, Salt Lake 
City, Utah, who reports them to be extremely injurious to all kinds of fruit-trees and 
other vegetation. (Riley's unpublished notes.) 
Larva. — Head black, legs black; abdominal feet pale testaceous. Body black, 
faintly dusted with rusty, which forms an exceedingly broken and indistinct lateral 
Line and a more complete double dorsal line. Each segment carries a lateral, trans- 
verse, very faint linear dot above the lateral line, a dorsal pale blue median stripe, 
and on the -hie two irregular pale blue patches separated by a deep black space. 
The dorsal ami lateral hairs are all tawny. The general appearance of the larva is 
tawny brown. Length about 1.40 inches. 
Cocoon. — Constructed in the crevices of bark or in the angles of masonry, where 
accessible, and consisting of a loose, white web, in which is suspended the long ovate 
cocoon of dense papery consistency, thickened with a yellowish powdery gum. 
(Stretch.) 
Moth. — Cinnamon brown, with two transverse pale lines curved outward just be- 
fore ending on the costa. Base of the fore wings within the inner line lighter than 
without. Hind wings darker than the fore pair. Fringe of both pairs of wings 
broadly interrupted with pale brown. The female is lighter colored than the male, 
with two dark -brown lines, the other one continuing straight on to the costa. Be- 
neath, in both sexes, uniformly darker than above. Expanse of wings, male, 1 
inch; female, 1.20 inch. 
The caterpillar of a species of Clisiocampa, which I have now little doubt is that 
of C. californica, which I have bred from eggs received from Miss Emily L. Morton, to 
whom they were sent from Colorado by Mr. Nash, was abundant at Virginia City and 
Helena, Mont., on the leaves of the wild rose so common near those towns, its con- 
spicuous tents readily attracting the eye. A half-grown larva, found June 16 at 
Virginia City, measuring .75 inch in length, had a blue-black head. The body was 
blue on the sides, with dark spots ; a black subdorsal spot rudely resembling a St. 
George's cross occurred on each side of each ring. The median dorsal line was pale 
blue, interrupted by the sutures between the segments. On each side of the line was 
a brown ocherous patch. The hairs are ocherous brown ; the long ones paler. When 
fully grown it is about the size of the eastern tent-caterpillar (C. americana), i. e., an 
inch aud a half. The mature larva found at Helena, June 21, was described from 
life in my notes as follows: 
"Head grayish brown; body pale, grayish-blue on the sides, speckled with black, 
with a large black squarish patch extending above into the subdorsal broad longi- 
tudinal band, which is mottled with bright ocherous brown, short wavy lines. A 
pale bluish distinct longitudinal broad median dorsal stripe interrupted by the Butures 
between the segments. Hairs long, pale brown. Body blackish beneath." 
At this date the caterpillars had begun to be full-fed, and one caterpillar had spun 
a cocoon under a stone. 
This caterpillar differs from that of C. americana in having a broad blue dorsal 
stripe instead of a white one, and there is no broad lougitudiual black stripe, as in 
the eastern caterpillar. It also differs decidedly from the caterpillar of C. constricta 
Stretch, the dorsal stripe being blue instead of forming a series of black and ocher- 
ous red spots. The blue dorsal interrupted stripe varies in distinctness and may be 
nearly or quite absent. In fact, this caterpillar is exposed to much variation, aud 
it would be easy to make several species out of this widely diffused one, which in 
Colorado feeds on the aspen. A blown specimen received from Prof. J. J. Rivers 
" from the mountains of Nevada that may be C. fragilis" is unquestionably a very 
distinctly marked larva of C. californica. My Montana specimens closely resemble 
it. In Mr. Rivers' Nevada examples the row of long dorsal pale-blue, almost whitish 
