MEMOIRS OF THE NATIO^^AL ACx'lDEMY OF SCIENCES. 
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abdominal segments are of the same color, but the other piliferous dorsal warts are yellow. There 
are four parallel whitish gray dorsal lines, or rather three dark, livid-brown, fine dorsal lines 
oil a grayish white field. 
Last stage XY. tig. 1). — Length, li.j mm. Head brown black, flattened, as wide as the body; 
with gray hairs. The prothoraeic plate is widely divhled into two transversely oval brown-black 
plates. The body is marked with a broad, dorsal, ash-gray band, (nuitaining. three Vandyke brown 
more or less broken lines. The sides of the body darker and containing two darker, irregular, 
broken lines. On the first thoracic segment are no dorsal yellow warts, but two on each side, the 
upper one in fi’ont of the spiracle, button like, prominent. On the second and third thoracic 
segments are four yellow tubercles, forming a transverse series. On the second to eighth abdom- 
inal segments the yellow warts are avi-auged in a very low trapezoid, and the two anterior ones 
are minute. Those on the ninth segment form a curved line. Tlie suraual plate is broad and 
rounded, speckled with black. There are no humps or st>ecialized warts on the first ami eighth 
abdominal segments, thus differing from the larva of /. Uiclum. The thoracic legs are blackish; 
the abdominal and anal legs livid ash. 
The larva differs decidedly from that of J. inchisa^ thongli the moth is nearly allied. 
The moth breil from this caterpillar is of the dark mouse-colored form, normal, usual in Maine 
and Franconia, N. H. One like it from Illinois is in my collection. 
The following description is of a larva I’eared in Maine from eggs received from Mr. Wiley, 
of jVIiles City, Mont., and, as Dr. Dyar states, is ^Hhe i)ale Western form,*’ and perhaps var. 
astovUv (Edw.). 
lAfe hlstorg of var. ornata suhvar. astoriw (PL XY, figs. 2, — The eggs were kindly sent me 
by .Air. C. A. Wiley, of Miles City, Alont. ; they were deposited on the willow May 24, and 
were reeehxHl June 5, but the larva had hatched out and must have heen feeding several days, as 
the body was filled out, the head not being quite so wi(le as the body. The larvie feed on the 
underside of the leaf, and if transferred to the upper side walk back beueatli. 
Ugg. — -Diameter, 0.7 inin.; hemisplierical or fiattened conical, moderately high, very broad, 
broader than high; the surface not regular, having an irregular meridional swollen portion, the 
top being somewhat swollen. Tlie surface is pitted as seen under a lens. Under a one-halfinch 
objectiv'c it is divided into slightly convex polygonal areas, with definite thin raised e<lges. 
The hole eaten by the larva for its exit is characteristic, being round, with the edge 
crenulated, each concavity representing the incision made by the jaws; in some cases the disk cut 
out is connected by a stalk with the side of the hole. 
Larva. Stage I . — Length, 4 nun.; head black; body long and full, with the segments rather 
full and convex, especially on the sides, oarticularly on the sides of the third abdtuninal segment. 
The first and eighth abdominal segments fuller^ more convex than the others^ and. dorsally sivolleny 
almost humped.^ and dull dark varnish or intchg red. causing iheni to he very distinct in appearance 
from the other abdominal segments. Along the sides of the body is a broad longitudinal band of 
the same jiitchy red hue; it is most distinct and continuous on the abdominal segments,. but 
divided into two broken lines on the upper edge, and it is a little broken on the three thoracic 
segments, where it is most einj»hasized on the swollen sides of each segment, and wanting in the 
sutures between the segments. The body is gi-eenish yellow, and in the dorsal yellow portion 
of the back are three iaint broken parallel equidistant dorsal lines. On the side of the body 
low down ai’e three broken reddish brown lines, the lower one the broadest, and passing along 
the base of the abdominal legs. The hairs are of* unequal length, whitish. Prothoraeic ])late 
short and wide, black, distinct. Suraual i)late broad, short, triangular, black. Thoracic legs 
blackish; abdominal legs (iucliiding the anal ones) pale greenish, the color of the body, but with 
a dark chitinous callosity on the outside Just above the planta. 
Tlie larva molted June 14-15. 
Stage IT . — Length, 8-1 1 mm. Head flattened, small, not so wide as the body. A short, bivjad, 
dark brown prothoraeic shield, not interrupted in the middle. The first and eighth abdominal 
segments decidedly swollen above, almost humped; the color chocolate-brown, and concolorous 
with the broad lateral band, which incloses two faint, pale, broken lines, and is often broken. 
