138 THE BROWN-TAIL MOTH. 
abdomen and thorax, but none are on the antenna?, legs or 
wing-covers. The pupal stage lasts for about twenty days. 
. The Moth. — Most of the moths emerge during the second 
week of July (July 6 to 10, 1905, mostly emerging on 7th 
and 8th.) They usually emerge late in the afternoon and 
are ready to fly that night. Both sexes are pure white, 
except the abdomen, which is dark brown. The wings of 
the males expand about one and one third and those of the 
females one and one half inches, as shown natural size in 
figure 25. The tip of the abdomen of the female forms a 
large tuft or brush of golden or dark brown hairs, to which 
is due the name of the insect. The moths are strong fliers 
and are readily attracted by lights. 
Fig. 26.— Eggs of Brown-Tail Moth on leaf. (After Kirkland.) Reduced. 
Eggs. — Egg-laying commences at once. The eggs (Fig. 
26) are usually deposited on the under sides of the outer 
leaves of the tree, toward the tips of the limbs. An egg 
mass is about two thirds of an inch long by one fourth of 
an inch wide, contains from two to four hundred eggs, and 
is covered with dark brown hair from the tip of the abdo- 
men of the female. The egg mass is elongate and is de- 
cidedly convex or ridged. 
The eggs hatch in about three weeks, about the first of 
August. (Those at laboratory hatched July 31 to August 
4, 1905. Were observed hatching at Rochester August 10, 
when almost all had hatched.) The young caterpillars feed 
upon the surfaces of the leaves, skeletonizing them, and 
when abundant causing the foliage to turn brown, as if 
