WOOD-NYMPH MOTHS. 71 
part of the body, and in this manner assumes the position 
of a Sphinx caterpillar. 
When mature the caterpillar descends to the ground, and 
transforms to a dark-brown and rough pupa, about seven- 
tenths of an inch long, with an obtusely conical tip of the 
abdomen, ending in four tubercles. In captivity it readily 
enters pieces of soft wood, or of cork, in which it forms a 
cell for the purpose of pupation; by uniting with a sticky 
secretion bits of wood and cork it forms a cap or lid over the 
cell. 
Like the Eight-spotted Forester this insect is kept in 
check by parasites, but chiefly by Tachina flies, which de- 
posit their cream-white eggs upon the back of the caterpil- 
lar, usually close behind its head. 
THE PEARL WOOD-NYMPH. 
(Eudryas unio Hub.). 
The moth (Fig.69 and 70, Plate X) of this equally pretty 
insect is a little smaller than grata, measuring with ex- 
panded wings about one inch and 
three-eighths; it differs but slightly 
from itslargerrelative. The brown- 
ish-purple stripe on the front mar- 
gin extends farther along the wing; 
Fig. 69.—Eudrvas unio Hub; the bordering of the outer margin 
Adult. After Rilev. E - : 
is paler and more uniform in 
width; the inner edge is wavy instead of straight, and the 
bordering of the hind margin is wider and more distinct. 
The larva is nearly an inch and a quarter long. It has 
an orange-colored head, spotted with black; its body is 
banded with orange, white and black, most segments hav- 
ing three white and three black lines on each side of the cen- 
tral orange band. The pupa is reddish-brown, roughened 
on the back with very minute teeth; a thick and blunt spine 
occurs on each side of the tip of the abdomen. 
