PACKARD.] THE population of AN APPLE THEE. 183 
leaden blue. The hind wings are dark ash brown. Beneath, 
the fore wings are not mottled, but uniformly dark ash 
brown, and a shade lighter than the upper surface of the 
hind wings. It expands about *55 of an inch. 
It varies in the distribution of the black spots, and in the 
degree of angularity of the outer edge of the basal dark 
portion of the fore wings; and in some specimens the 
middle of the wing is concolorous with the other parts, and 
the peculiar leaden blue scales are scattered over the whole 
wing, with a black patch on the inner third of the wing near 
the inner edge. In some specimens there are more than 
four dots near the outer edge of the wing, forming a trans¬ 
verse row. 
As these worms attack the fruit and leaf-buds, it is diffi¬ 
cult to pick them off by the hand without injuring the buds ; 
nor is it easy to apply whale-oil soap or a weak solution of 
carbolic acid. Both of these remedies, however, should be 
tried, especially showering the terminal branches of the tree 
with soap suds or a very w^eak solution of carbolic acid. 
A faithful application, for one season, of these and other 
remedies, will materially lessen the numbers of this formid¬ 
able pest. 
The Palmer Worm .— During the latter part of June, as 
observed on the Hudson River, the leaves of the apple be¬ 
come badly worm-eaten, with the remnants carelessly sewn 
together with fine silken threads. When the bunch of leaves 
is disturbed, out scrambles a pale yellowish green caterpil¬ 
lar, with a dusky stripe along each side, edged above with a 
narrow white stripe, and drops a few inches, hanging sus¬ 
pended by a thread. This is the Palmer worm described 
under the name of Chcetochilus pometellus (Harris). 
This insect has not been of late years at all common in 
our orchards. We have had no personal acquaintance with 
it, and the following account of it is condensed from Fitch’s 
admirable description. There are insect years as well as 
23 
