896 FIFTH REPORT OF THE ENTOMOLOGICAL COMMISSION. 
front of segment l is pale green, and the incisure of segments 2 and 3 is shining black. 
The three dorsal Boots are pale greenish-yellow : the central spot, on segment 7, has 
a jleur-de-liti form ; the followingohe, on segment 9, is small and geminate, and on seg- 
ment 11, in a Dumber of the larva-, is a fourth spot, usually smaller than the pre- 
oeding. Of the tubercles, arranged in subdorsal rows, those on segment 8 are the 
largest, exceeding in height and diameter of base those on segment 2. and an- di- 
rected somewhat backward. A lens shows short hairs over the body, and on the 
Bummit of the tubercles arc larger ones, curving inward ; the body is lined with short 
black streaks. From the tip of the lappets long black hairs of an unequal length 
are given out, while their margins and intervening portions of the body bear numer- 
ous shorter gray hairs, many of which are barbed ; these form a fringe directed down- 
ward when the larva is resting on a small branch, wholly concealing the legs and 
nearly hiding the long: prologs. In addition to these lappets (a substigmatal row), 
there is a single one of a little larger size on the first segment, in front' of the first 
spiracle, the hairs of which project along the side of the head. All the lappets are 
margined with a black line which is more distinct upon the anterior one; the first 
three point forward, the others backward. The larva has the power of elevating or 
depressing one or more of the lappets at pleasure ; when in motion they are borne 
horizontally ; at other times, all but the thoracic ones are depressed. The prolegs 
are obscure greenish. The ventral region is of the same color, with a lenticular 
blackish spot on the tirst five segments. 
Cocoon. — The first cocoon was spun on the 17th of May, forty-three days after the 
earliest hatching of the larvae. Within two days seven cocoons were made ; in all, 
thirty-three were obtained. For the reason that the twigs upon which the larvae had 
been fed were of a small size, and without the branches at the giving off of which the 
cocoons are usually placed, nearly all were spun upon the fiat sides of the feeding 
cage, where they presented the appearance shown in Fig. 20; none were placed in 
the angles or corners. Their ground-work usually extended at some distance beyond 
the cocoon proper, for while its average length was less than one inch, that of the 
ground- work often exceeded one inch and a half. The cocoon is of a pale gray color, 
elongate oval, quite flattened beneath, its elevation being but about one-half its 
breadth, roughened externally, smooth interiorly, moderately firm and thick, but 
diaphanous, composed of two layers of silk, which are usually more closely united 
than represented in Fig. 21, which shows the under surface with the thin lower layer 
forming the ground-work removed, disclosing the pupa-case from which the moth has 
emerged through the ruptured upper part of the cocoon. 
Pupa.— The pupa is dark brown, about 0.60 inch long, from 0.27 to 0.30 inch broad 
across the wing-cases, and only about 0.18 inch thick, being much flattened beneath. 
The incisures are deep and the segments well rounded, and continuing broad in the 
female, as shown in the figure, until their abrupt termination. The anal segment 
is tipped upon its upper side with two minute sharp teeth or by a bifid tubercle, hav- 
ing a small granulation (shown under a lens) on each side. The male pupa is readily 
recognizable by its narrower terminal segments, and the well-defined autennal cases 
showing at the point of the auteunal twist a sensible contraction, and above it abroad 
lobe like expansion outwardly beyond the regular curve of this portion of the pupa. 
The features of the female pupa are essentially shown in the pupa case, represented 
within its cocoon, in Fig. 21. 
Pupation. — The pupation was quite brief— only twelve days, if three days be allowed 
tor the change within the cocoon of the larva to the pupa. The first moth emerged 
June I. The following is the record of dates of emergence of the thirty-three exam- 
ples obtained ; it is of interest in not showing the priority in the time of the male, 
which is found in many lepidoptera, but a singular alternation between the sexes of 
the first half of the brood 
