312 
THE STUDY OF INSECTS . 
her eggs on her cocoon, but, unlike the two preceding species, 
does not cover them with anything. The larva differs from 
either of the preceding in having an extra pair of pencils 
of plume-like hairs arising from the sides of the second 
abdominal segment; the head is jet-black; the glands on the 
sixth and seventh abdominal segments are vermilion-red or 
sometimes bright orange ; and the tubercles on the sides of 
the back of the second and third thoracic and the sixth 
and seventh abdominal segments are orange-red or yellow 
margined with pale yellow. 
The Gipsy Moth, Porthetria rfw/ar (Por-the'tri-a dis'par).— 
This is a European species which has been introduced into 
Massachusetts. It has become such a serious pest that the 
Legislature of that State has appropriated a large sum of 
money to be expended in efforts to eradicate it; this work is 
now going on. The male is yellowish brown; the female, 
white (Fig. 378). In each 
the fore wings are crossed 
by many dark lines and bear 
a black lunule on the discal 
vein. The specimen figured 
is unusually small. The eggs 
are laid in a mass on any 
convenient object and are 
covered with hair from the abdomen of the female. The 
larva differs greatly in appearance from that of the preceding 
genus, lacking the peculiar pencils and tufts of hair ; but the 
characteristic glands of the sixth and seventh abdominal 
segments are present and are red. The body is dark brown 
or black, finely reticulated with pale yellow, and with narrow 
yellow dorsal and subdorsal lines. On the dorsal aspect of 
each segment there is a pair of prominent, rounded tubercles 
bearing spiny black hairs. The first five pairs of these 
tubercles are bluish, the others dark crimson-red. There 
are also two rows of tubercles on each side of the body 
which bear longer hairs. 
Fig. yfi.—Porihctria dispar , female. 
