Some Insects Attacking the Peach. 5 
While hibernating the larvae vary somewhat in size, but are all 
very small, and their detection is somewhat difficult, except when 
very close observations are made. The presence of the larvae them¬ 
selves during the hibernating period, could scarcely be detected 
were it not for the fact that they construct, at the entrance to their 
burrows, tiny silken tubes covered on the outside with bits of bark, 
which were chewed off by the larvae while excavating the hiber- 
liacula. These little tubes are shown in the crotch of a tree in Fig. 
3, and again one is shown at the entrance to a burrow containing 
larvae in Fig. 2. The larval cell is also lined with silk, the silken 
tube being merely a continuation of this cell lining. Throughout 
the winter months the hibernating larvae remain inactive within this 
cell. Apparently no feeding is done after the time that they con¬ 
struct the cells until they leave in the spring, consequently no growth 
takes place during that time. A hibernating larva, magnified 26 
diameters, is shown in Fig. 1. These larvae are exceedingly well 
protected in their hibernacula, and Mr. Warren T. Clarke’s experi¬ 
ments in California show that they are almost impenetrable to even 
an oil spray during the winter season. 
In the spring of the year, about the time the peach trees bloom, 
the larvae leave their winter quarters and eat into the tips of the 
twigs, either beginning their work at the extremities or a short dis¬ 
tance below, sometimes hollowing them out for usually a distance of 
less than an inch from where the twig was entered, leaving a mere 
shell or hollow cylinder of the portion in which they have fed. Again 
they may merely gouge out the tip of a twig on one side, entering in 
as far as the pith and then leaving for some other twig. Thus they 
go from twig to twig, feeding first in one and then in another, until 
often the tips of a great many branches will be killed back, thereby 
