Dec. 1896.3 Dyar : Life-Histories of N. Y. Slug Caterpillars. 181 
season—during July. The eggs are laid singly and well scattered. The 
young larvae after emergence from the egg rest at the edge of the leaf 
on the under side and moult at once without feeding. During their life 
history they remain on the under side of the leaves, finally falling to the 
ground to spin their cocoons during September. They occur on forest 
and shade trees, not usually on very low bushes. 
There are eight larval stages normally, occasionally nine, the extra 
stage being interpolated between the last two as in Enclea. 
The present life-history was worked out from a newly hatched 
larva which I found on a white oak leaf at Bellport, Long Island, rest¬ 
ing beside its egg shell. 
Criticism of Previous Descriptions. 
Harris’ figures are good. In the colored one the yellow subdorsal 
line is omitted, while in the structural one the thoracic region is not 
properly segmented. Dr. Hulst describes the head as “ strongly bifid, 
etc.,” evidently referring to the anterior edge of joint 3 ; otherwise the 
description is excellent. In my own first general description I omitted 
to mention the subdorsal horns. In my later one I located the second 
and third subdorsal pair too far forward (they are on joints 4 and 5, 
not on 3 and 4 with a gap at 5 as I stated), and I mistook the lower 
lateral segmental glandular dots (5) for spiracles on joints 6 to 12, thus 
placing them above, instead of below, the lateral horns. Mr. Beuten- 
mueller locates the red marks on segments 8 and 10 instead of 9 and 11, 
probably owing to a failure to recognize the true relations of the anterior 
horns. Dr. Packard treats this species with unusual brevity, confining 
his remarks to an explanation of the figures of the spines of the lateral 
horns. Yet, curiously enough, an error has crept in, for the figure is 
stated to represent ‘ * one of the lateral tubercles of the first abdominal 
segment” (joint 5), which really bears no lateral horn at all. 
The attention given to this curious larva heretofore is far less than 
it deserves. The early stages are entirely unnoticed. 
Description of the Several Stages in Detail. 
Egg. —Elliptical, flat, reticulations distinct in the empty shell, 
linear, triangular, quadrangular, rarely pentagonal, irregular; transpar¬ 
ent, colorless, the shell white; size 1.6 X-9 mm. Laid singly on the 
under side of a leaf. 
Stage I .—(Plate IX, fig. 1) head whitish, eye black; body ellipti¬ 
cal, dorsal space broadest anteriorly, gradually narrowed to the tail, not 
