8 
When working in the succulent new growth the larve bores rather 
rapidly, sufficiently so at least to excavate a burrow two-thirds of its 
length in an hour. The length of time spent by the hibernated larve 
in coming to full growth in the green shoots is comparatively short, 
not exceeding ten to fifteen days. 
In California, and also in the District of Columbia, the larvie begin 
transforming to pup in the latter part of April, and the moths of the 
first brood emerge throughout May. In Colorado, Mr. Gillette has bred 
the moths the first of June and also toward the end of July. In Oregon, 
Mr. Cordley secured his first pupa on May 8 and his first moth on 
May 17. 
The adult larva tapers strongly toward either end, and attains a 
length of three eighths to a half an inch, or slightly more when in motion. 
It is of a dull reddish-brown color, the reddish color predominating 
before maturity and the latter after maturity, and the head and the 
cervical and anal shields are dark brown or almost black. The space 
between the segments is noticeably light-colored, and especially between 
the second and third thoracic segments. The hairs are long and spring 
singly from minute tubercles. Other details of structural features are 
shown in the illustration (fig. 2, b). 
In confinement the larva on reaching full growth spins a scanty web, 
in no sense a close cocoon, in the leaves and rubbish about the trees, or 
on the trees in the dried and shriveled leaves of the injured shoots, or it 
attaches itself exposed on the twigs or bark. After thus securing itself 
the larva immediately pupates, becoming a brown, rather robust, chrys- 
alis (fig. 2,c,d). In midsummer these transformations are very quickly 
accomplished. A larva, for example, which webbed up June 29, pupated 
July 1, and the adult emerged July 8. 
Mr. Ehrhorn states that itis very difficult to find the pup in orchards, 
as the larve hide in all sorts of places, as in crotches of the branches, 
between dried leaves, and about small peaches likely to drop off. 
The chrysalis stage lasts from seven to ten days, and the moths of 
the first brood begin to appear early in May and continue to emerge 
throughout this month and into June in the latitude of Washington. 
The adult moth is less than a quarter of an inch in length, expanding 
a little more than half an inch, and is of a beautiful dark-gray color, 
with darker spots on the forewings, as indicated in the illustration 
(fig. 3). It is a handsome insect, and has a peculiar way of resting with 
its palpi bent back over its head and its antennz laid closely down on 
the wings. 
The actions of the moths out of doors have been recently described 
by Mr. Cordley. During the daytime they remain perfectly still on the 
bark of the tree, and with the forepart of the body slightly raised and 
the labial palpi held rigidly upright in front of the face. They so 
closely resemble small, rough projections of the bark that it is almost 
impossible to distinguish them. When disturbed they dart rapidly 
about for an instant and then as suddenly alight in a new position. 
