452 
JOURNAL OF ECONOMIC ENTOMOLOGY 
[Vol. 11 
Descriptions 
Egg. The egg is reddish-brown, .36 mm. to .4 mm. in diameter, and slightly over 
.2 mm. in height. Its shape is somewhat like an inverted teacup with the rim glued 
fast to the leaf surface; the central part of the top surface is depressed and forms an 
outer circular ridge; the sides are strongly ridged. 
Larva. The larva is cylindrical, broadest at third abdominal segment, with head 
and anal segment sub-equal in breadth. The young larva is bright orange, with a 
suffusion of reddish in the regions of the thorax and penultimate body segment. The 
head, prothorax, thoracic plates and anal segment are strongly chitinized and appear 
dark grayish-green. The thinner chitin of the rest of the body appears granulated. 
The three pairs of prolegs are hyalin. From the heavily chitinized portions issue 
long thin pale spines and the lightly chitinized portions bear a number of short spines. 
The longest spines are in length about one quarter the maximum width of the caudal 
segment. On the lower surface of this segment is a transverse row of from 10 to 22 
short hook-shaped bodies. In the mature larva the chitin plates are blackish, as are 
also the prolegs, while the body color is grayish-yellow. In the older larvae distributed 
over the central part of the abdomen are six sets of hooklets similar to those on the 
ventral surface of the anal segment. These sets consist each of two short parallel 
rows of from 3 to 9 hooklets. There are two sets on each of abdominal segments 3,4, 5. 
Pupa. Light brown, cylindrical in shape; antennae reach slightly beyond the 
caudal extremity; wing-pads reach almost to caudal end; body clothed with sparsely 
distributed pale hairs. On the dorsum runs a darker median stripe about half the 
width of the body. Length 5 mm., maximum width about 1.3 mm. 
Pupa Case. Black; somewhat roughened; tubular; on the thickened cephalic 
end are two papery flaps or wings, one on each side; apex curved in the nature of 
the butt of a pistol. Dissection of the case discloses a hidden slit running the whole 
length of the ventral surface and continued across the apical surface, by which means 
the moth emerges. Length about 6.5 mm.; width at cephalic end about 3.2 mm. 
Adult Moth. General appearance silvery white; abdomen light brown; antennae 
silvery with annulations brown; head and thoracic dorsum with silvery pubescence 
and hairs; palpi fringed w r ith long hairs, the inner ones white, outer ones brown; eyes 
black; upper wings white, flecked with light brown spots; lower wings greyish; both 
wings with fringes of long brownish hairs on hind margins; legs clothed with silvery 
pubescence, the femora also with long white hairs; under side of body with silvery 
vestiture; under side of wings dark brown. Length of body about 4.3 mm., length of 
antennae about 3.2 mm., length of wings about 6.4 mm. (Plate 15, fig. 3.) 
In nature the normal position of the moth is with wings folded over the body and 
antennae porrect. 
Parasites 
The larva is commonly parasitized by a small blackish pteromalid 
fly, Eurydinota flavicorpus Girault. 
In 1910, on the dates April 29 and May 2, out of 80 cases examined 
7 were parasitized, while on May 14 out of 55 cases examined 23 or 42 
per cent were found to be parasitized. This would indicate that the 
parasitism did not make itself evident until the larva was nearly ma¬ 
ture. In 1916 about one-third of the cases collected for the rearing of 
adults gave parasites instead. There are from 10 to 20 parasites in each 
case and they make their exit out of a single circular hole at the apex 
of the case. They issue at the time when the last moths are emerging. 
There are no records of predaceous enemies. 
