10 
young growth. The later brood is said to attack the fruit near the 
stems. The occurrence of the larvee during the winter in the situa- 
tions noted is also thought to explain the fact frequently noted that 
the under and inside twigs, being the more accessible, suffer the most, 
while the exterior and topmost branches escape. 
Our later studies confirm, in the main, Mr. Ehrhorn’s conclusions as 
to the habits of the larvee. That the larve make any essential growth 
in the winter, however, is probably a wrong inference, as will be shown 
later, and the nearly full grown larve referred to were doubtless indi- 
viduals that were wandering from one point to another, and had merely 
reached nearly full growth before they were observed. 
Both in the orchards of California and by means of the abundant 
material received at this office we have been enabled to make a careful 
study of the hibernating gal- 
leries or chambers of the young 
larve. These occur not only in 
the crotches of the smaller and 
sometimes quite large branches, 
but many of the larvee utilize the 
roughened bark at any point. 
They burrow into the bark for a 
short distance, penetrating little 
more than the upper superficial 
. layer, and form slightly elongated 
Fig. 1.—Anarisa lineateila: a, twig of peach, showing chambers (fig. 1 ¢); which are 
in crotch minute masses of chewed bark above linea with white silk and the 
larval chambers; b, same much enlarged; c,a lar- z 5 
val cell with contained larva, much enlarged; d, opening afterwards closed. The 
dorsal view of young larva, more enlarged (origi- ]oeation of the larvze may be 
ae readily recognized by the little 
masses of projecting excrement or comminuted bark at the entrance to 
the burrows (fig. 1 a, b). The size of the burrow and the fact of its 
being lined with silk precludes the idea that the larve feed in the fall 
or during hibernation, except perhaps in the mere operation of exca- 
vating the chamber. 
The young larva, as taken from the burrow, is not above 2 milli- 
meters long, and is of a general yellow color, with the head and cervical 
and anal plates dark brown, almost black (fig. 1 d). 
While in their winter quarters the larve are subject to the attacks 
of predaceous mites, and many of them are destroyed by this means, 
as will be later noted. They are also occasionally parasitized by a 
chalcidid fly. 
Harly in April the larvee begin to abandon their hibernating quarters 
and attack the new leaf shoots, but some individuals were found in the 
erotches by Mr. Ehrhorn as late as April 21. The damage becomes 
noticeable, as a rule, at the time the shoots are from one-half inch to 2 
inches in length, or, more properly speaking, mere clusters of newly 
expanded leaves. 
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