876 
[Assembly 
which, as w6 shall presently see, it is nearly related. When it is 
disturbed, with a wriggling motion it runs briskly backwards, or 
by a fine cob-web like thread lets itself down from the leaf. Its 
castings are little black grains, which appear like gunpowder 
sprinkled thickly over the leaves and the ground beneath them. 
The pupa or. chrysalis is enveloped in a very pretty gauze-like 
cocoon, w'hich may be found attached to the e ten 
leaves, two or more of them frequently in a clus¬ 
ter together. It is spun of clean white threads, 
crossing each other and forming an open network, through the 
meshes of which the inclosed chrysalis may be distinctly seen. 
The threads composing the net-work are coarsish and not very 
stout. They may readily be broken with the point of a needle, 
and the inclosed pupa be thus removed from its case for exami¬ 
nation, though the cocoon is so slightly attached to the leaf that 
it is frequently torn loose in thus breaking it open. 
Interspersed with these gauze-like cocoons upon the leaves, 
others may be met with quite different in their appearance, being 
opake and of a thick paper-like texture and a brown color. They 
are ol an eliptic form, rounded at both ends, and only about the 
tenth of an inch long and a third as broad. These have been 
constructed by the larvae of parasitic Ichneumon-flies which have 
destroyed the worms of the cabbage moth. And from the infor¬ 
mation I possess, it appears that this parasite deposits but a single 
egg in each worm, from which a maggot hatches, which feeds 
internally upon the worm, yet without attacking any vital part 
whereby the worm would be prematurely destroyed. Thus the 
paiasite, as in other cases of this kind, attains its growth at the 
same time that the worm reaches maturity, when the maggot 
finishes its work by destroying the little that remains of its foster 
Parent, and immediately incloses itself in this paper-like cocoon. 
Ot three mature worms which I inclosed in a small box over 
ni ';ht, only two were found the next morning. All vestiges of 
the third had disappeared, and in place of it was one of these 
paper-like cocoons. 
But as the worm oi the Cabbage moth is such a choleric, mer¬ 
curial little fellow that when he is molested, be it ever so slightly, 
