Coccids, and obtained some forty or more larvae which he transported 
to the laboratory and watched in confinement. Struck by the enor- 
mous destruction of Coccidae by these larvae, he followed their transfor- 
mations carefully throughout the season of 1892 and discovered five 
successive annual generations. The first appearance of the adults, few 
in number, occurred about the middle of May; the second, moderately 
numerous, towards the third week in June ; the third, very abundant, 
about the middle of July; the fourth, equally abundant, about the end 
of August; and the fifth, again few in numbers, towards the end of 
September and during the early part of October. The falling off in 
numbers of the last generation is largely accounted for by the lack of 
food. The larva? feed only upon large Bark-lice, those females which 
are full-grown or nearly full-grown, and such individuals occur most 
numerously in June, July, and August. Except during these three 
months, the only individuals at all abundant are of inferior size and 
retarded through poor nourishment. The falling-off in the number of 
moths in October results, then, from the fact that the September larvae 
have not been able to find enough large Coccidae. 
The adult insects of both sexes resemble each other closely, and both 
afford a striking example of protective resemblance, simulating in repose 
sparrow droppings. The moths issue at the close of the day, and upon 
emerging from the cocoon are extremely active. Whatever the position 
of the cocoon, whether upon the leaves, branches, trunk, or base of the 
tree, the moths drop immediately to the ground after emergence from 
the cocoon. They jump, roll over on the back, and vibrate the wing 
pads actively for forty seconds and finally become perfectly motionless. 
Three or four minutes after birth their wings become expanded, and 
they fly up among the leaves and branches of the tree from which they 
have previously fallen. During daylight the moths remain motionless, 
the wings held close to the body, in which attitude, on account of their 
size, coloration, and general aspect, they bear the close resemblance 
just mentioned to the excrement of small birds. Copulation, which is 
of short duration, always takes place at night, the period during which 
the moths are active. The males live only one or two nights, in all 
probability, while the females in captivity live ten or twelve days at the 
least. Egg laying lasts several days, and each female produces about 
a hundred. These are deposited one at a time and each is separated 
from the other by a large interval of space. The female scatters them 
by preference upon the leaves or the young buds, although they are 
often laid directly upon the back of the Bark-louse. 
The young larva at once enters its host, devouring all the inter- 
nal organs, leaving only the dorsal carapace, which is more or less 
thick and hard. A Ooccid which has been attacked always shows 
at some point or other on the dorsal surface an opening by which 
the predatory larva has entered. The young larvae are of a red-wine 
color, except the head, which is brown, and this coloration lasts until 
