134 
MEMOIKS OF THE ^^ATIONAL ACADEMY OF SCIENCES. 
type of T, jocom. The latter is also more generally subocherous than usual, and without a line on 
the hiinl wing. 
For the opportunity of examining five alcoholic exain])les of the first stage of this larva, I am 
indebted to Professor Hiley; those of the last stage I have collected from the poplar. Mr. H. 
Edvairds (Papili(>, iii, 24) brielly describes the second stage, and adds that it “feeds in companies 
until after the secoml molt; the larvui then se])arate and act indei)endent]y of each other.*’ 
The eggs of the normal form of this s])ecies (i. e., 1. inclufui) were received from 'Slv, W. N. 
Tallant, of Columbus, Ohio. They were laid July 20 and the larva' hatched August 10 or 11. It 
feeds at first socially on the aspen, eating out patches on the under surface of tlie leaf. 
E ()(/. — Diameter about 0.0 mm. Eemispherical, rather high; the shell is thin, white (the egg 
is reddish Just before the larva hatches). The shell under a Tolies half-inch objective is seen to be 
covered with minute polygonal cells which are tolerably distinct, with slightly thiekene<l walls. 
Larra^ Stage 7. — (Hatched August 10-11. Described two days after hatching, and also from 
alcoholic si)eciniens of the same brood.) Length, 3 mm. The body is rather long, cylindrical, 
head rounded, but little wider than the body at first before the latter becomes tilled out after 
eating a few days, as later it is no wider than the body; it is shining Jet-black, and provided with 
scattered, long, stitf, tai>ering bristles. The prothoracic and suranal plates arc shining brown- 
black. The former is moderately large, about three times as broad as long, irreg^darly trapezoidal, 
narrowing a little behind, and shows no signs of div ision into two halves; four hairs arise from 
the front and four I'rom the hinder edge. The piliferous warts on the. thoracic as well as 
abdominal segments are more or less conical, and none bear more than a single hair. The second 
tlumicic segment bears two minute median dorsal tubercles, one on each side of the median line 
of the body, and smaller than those on the third segment, while the next one on each side of the 
body is larger than the homologous ones ou the third thoracic segment. The tubercles on the 
sei^ond and third thoracu! segments are arranged across the segment in a straight line, four of 
them being visible on each side above. Ou the abdominal segments the four dorsal tubercles are 
arranged in a more or less curved line, the curve becoming more marked toward the end of the 
body, until ou abdominal segment S the curve is almost semicircular. On the first abdominal 
segment the two median tubercles are larger than any ou the thoracic segment, and are larger 
than tlie siibdorsal and lateral oiiesou the segment in (luestion, and are decidedly larger than the 
homologous ones on the second to seventh abdominal segments. The four dorsal tubercles on 
segments 2 to 7 are all of the same size, but the two ou the eighth segment are nearly as large as 
tliose oil the first, and are about twice as large as those ou the seventh abdominal segment; on 
the eighth segment, however, the subdorsal tubercles are nearly as large, but are narrower than 
the two in the middle. This segment is slightly humped, and bears a brown spot surrounding the 
bases of the two twin tubercles, and a similar spot occurs ou the first abdominal segment. The 
four dorsal warts on segment 9 are arranged in a trapezoid, the two in front being one-half as 
large as the two behind. The upper subdorsal row of tiibei’cles are iiartly connected by short 
lines or streaks, and between this and the next row of warts lower down is a broken fine brown 
line, which is, however, almost obsolete. A fine nearly obsolete (or is it incipient f) dor.sal brown 
line. Ill more advanced specimens the body is jdainly strixied on each side with three interrupted 
dark reddish lines. The piliferous tubercles or warts are dark brown, and give rise all over the 
Ixxly to but a single hair. A pair of especially large long hairs arises from the second thoracic and 
ninth abdominal segments. The hairs are long and slender, and though under a low ])ower they 
appear to be tapering, under a one-fifth objective they are seen to be docked or blunt at the end 
and some at least slightly but distinctly bulbous at the tip; they are also seen to be hollow and 
truly glandular; the end appears to he tlattened; as seen sideways, the hairs appear to taper. The 
hairs vary much in length, some being longer than the body is thick. An unusual, if not unique, 
feature, exceptional among bombycid hirvai in the first stage, is the inicroscojiic hirsuties clothing 
the body. Under a oue-fifth inch objective the microscopic hairs are very short, quite uniform in 
length, very dense, and taper to a point. 
The suranal ])late is distinct, blackish, nearly as long as broad, rounded triangular, and bears 
on the edge eight ])iliferous warts of nearly equal size, besides two arising from the surface, a little 
in front of the middle. The siifracles are round and remarkably small. 
