13 
“They resemble the caterpillars which we see on our apple trees, 
except that they are destitute of hairs. When particularly noticed, 
it is seen that they differ very much from each other in their colors 
and stripes; but. those which are recognized as most perfect are of 
a black color, with a pale yellow stripe along each side; others are 
greenish, or olive, with more numerous stripes and lines. And the 
worms occur of all sizes, mixed together, as they have hatched from 
the eggs earlier or later; those which are full grown being an inch 
and a half in length.” (Fitch.) 
“The mature larva is about an inch and a half long. Its cylin¬ 
drical body, divided into thirteen rings, becomes more contracted 
at the end, and is sparsely covered with short hairs. The head is cov¬ 
ered with a network of confluent spots, while along the face run 
two lines, diverging at each end. A light-colored, waved line, just 
above the legs, is succeeded by a dark one, then a light one edged 
with two thread-like, lines; while the upper part is dark, with an 
interrupted white thread running exactly through the middle of the 
back. The pro-legs, ten in number, are marked on their outer mid¬ 
dle and on their tip with black. Beneath, the caterpillar is of a 
livid green.”—(Packard.) 
“Immature Larva. — When newly hatched, 1.7 mm. long; dull, 
translucent white in color, with very minute piliferous points giving 
rise to pale hairs. Head large and uniformly brown-black; two 
front pair of pro-legs, atrophied so as to necessitate looping, in motion. 
Drops by means of a web. In the second stage it is quite active; 
still loops, and .spins a web, and drops at least disturbance. Head 
copal yellow, with six black ocelli (the two inferior somewhat sep¬ 
arated from the others); the brown jaws and brown legs conspicu¬ 
ous. Color of body yellowish green, darker anteriorly, the venter 
being quite pale. The lines of mature larva barely indicated, in 
faint rose brown; the most conspicuous being the broad stigmatal, 
a narrower one above it, and two pale, which are medio-dorsal. In 
the better marked specimens, the body above the sub-stigmatal line 
consists of eight dark and seven pale lines; the middle pale line 
medio-dorsal, the second dark one from it most faint and most 
often obsolete, and the lower or stigmatal one broadest and most 
conspicuous. Black, piliferous dots, distinct and normally arranged, 
i. e., on the middle joints, four trapezoidally on dorsum, two in 
stigmatal dark line, one just above, the other just behind stigmata, 
one at lower edge of pale sub-stigmatal line near the middle of the 
joint, and several that are ventral; the dorsal ones on joints 1 and 
12 forming a reversed trapezoid to those on middle joints; on joint 
11, a square; on joints 2 and 3, a transverse line. In the third 
stage, there is little change. The head has still a copal yellow aspect; 
being pale, with faint yellowish-brown mottlings; the ocelli still con¬ 
spicuous. The body is more decidedly striped, the dark stigmatal 
and pale sub-stigmatal lines more strongly relieved, and all the 
lines approach more to those of last stage. The pale hairs from 
piliferous dots are still quite noticeable, especially before and be¬ 
hind, and the dots themselves are generally relieved by a pale basal 
annulus. The looping habit is lost, but the front pro-legs are still 
somewhat the smallest. It now curls round, and does not spin in 
