746 NEW YORK-STATE MUSEUM 
of those forms that can not be controlled by fumigation; and, 
inasmuch as it is known to have been established in New York 
city and vicinity for nearly 20 years, it is surprising that it has 
not spread more rapidly. See pl. 3 for an illustration of the 
insect and its work. 
Birch leaf bucculatrix, Bucculatrix canadensisella 
Chamb. Last fall the white birches all about Albany were very 
badly affected by a small caterpillar which ate away the tender, 
under portion of the leaves. The skeletonized parts dried, 
turned brown, and the trees looked much as if they had been 
injured by fire: This year the pest appears to be even more 
numerous, having been very abundant about Albany. Its work 
was also observed all through the western two thirds of Massa- 
chusetts, and it has been reported as quite injurious in several 
localities in the northern part of New York. This attack is not 
unprecedented, though of considerable interest on account of 
its covering So large a territory. This insect was reported to 
Dr Lintner as injurious about Scottsville, Monroe co., in 1886, 
and in 1891 it seriously injured birches about Ausable Forks 
Nee Yi | 3 
The parent of this caterpillar is a little, brownish white moth 
with a wing spread of but 2 of an inch. The caterpillar is a 
delicate, yellowish green creature about + of an inch long when 
full grown. During the last half of August and the first half 
of September many can be found curled up under a white, silken 
covering known as the molting cocoon. Later a beautiful, 
white, ribbed cocoon will be constructed in which the winter is 
passed. PI. 4, fig. 5 illustrates well the appearance of the insect 
in its various stages. 
"Valuable trees can be protected by spraying with an arsenical 
poison, preferably arsenate of lead, taking special pains to get 
the poison on the under surface of the leaves. It is to be - 
expected that natural agents will soon reduce the numbers of 
this tiny pest and thus prevent the ultimate killing of the trees. 
Golden oak scaly Asterolecanium variolosum. 
Ratz. White oak twigs received from Yonkers N. Y. Sep. 16 _ 
were literally covered in places with this insect. The scales © 
