296 Report or THE ENTOMOLOGISTS OF THE 
DESCRIPTIONS AND LIFE HISTORY. 
The egg— The eggs are laid close together forming bands 
which encircle the twigs.’ These bands or masses are abruptly 
cut off on the edges and in this the egg-masses of this species 
differ from those of the apple-tree tent-caterpillar which are more 
distinctly oval in outline. The frothy covering also differs 
in color, being a dull gray instead of brown. As referred to 
on a subsequent page there is a noticeable variation in their size 
this year. Plate X XI, fig. 1, is from a photograph of two egg- 
masses which differ greatly in size. The upper one has the more 
typical shape. 
The eggs are placed on end side by side with somewhat more 
regularity than those of the apple-tree tent-caterpillar. According 
to Riley’ the female while depositing her eggs “ stations herself, 
for this purpose, in a transverse position across the twig.” The 
g-laying habits of three females kept by the writer in the labora- 
ese 
tory were carefully noted. The actions of these females indicate 
that there may be exceptions to the habits observed by Dr. Riley; 
for none of them placed themselves in a transverse position across 
the twig, but stood lengthwise of it or nearly so, and moved 
sidewise while depositing the eggs. When one row was finished 
the next was immediately commenced. The eggs were placed 
very close together. With each egg an abundance of frothy 
glue was discharged, completely covering it and hardening almost 
immediately. The females died within a few hours after complet- 
ing oviposition. 
When first laid the eggs are nearly white but soon became a 
dull gray. They measure on the average 1.2 mm. in length and 
.75 mm. in diameter at the upper end, tapering slightly to the 
lower end. They squarely cut off at the upper end but rounded 
at the lower. The upper end is also distinctly margined with 
white, the central area being darker and somewhat depressed. At 
first this depression is very slight but gradually more pronounced 
as the embryo caterpillar becomes fully formed. 
13 Amer, Ent. and Bot., 2: 261, 
