742, Report oF THE ENTOMOLOGIST OF THE 
taken for the eggs of the cabbage butterfly. Some people even 
think they are the eggs of the caterpillar, which is an impossi- 
bility. 
Another valuable native parasite is /teromolus puparum,; 
which according to W. B. Alword* deposits its eggs in the cater- 
pillar just before the latter changes: to a chrysalis. As in the 
preceding parasite the eggs hatch into footless maggot-like larvee, 
but in this case they feed on all of the soft parts of the chrysalis. 
which soon changes to a peculiar brown color and becomes hard 
and lifeless. The parasites change to pups within the chrysalis. _ 
When they hatch they have to bore through the chrysalis walls. 
From two to three hundred of these parasites have been bred 
from a single chrysalid. If, as has been recommended by some 
writers, the chrysalids of the cabbage butterfly are gathered to 
be destroyed, instead of being crushed they should be placed in 
a box and covered with mosquito netting. The parasites can — 
escape through the netting as they hatch, and the butterflies will 
perish in a few days. 
These two parasites are delicate insects and probably the 
heavy rains in early summer prevent their increase in numbers 
sufficient to check the increase of the cabbage but+erfly. 
Bacterial disease — Micrococcus of the cabbage cater- 
pillar. This disease was first observed by Dr. Forbes at 
Normal, Illinois, in 1883. He is of the opinion that it was first 
noticed in the vicinity of Washington, D. C., by Dr. Riley, in 
1879, although the latter evidently did not realize what it was. 
Tt is apparently similar to the “ /lacherie” or “ Schlaffsucht” ot 
the silk worm; that is, it is due to a microorganism. 
The disease can be quite accurately distinguished by external 
appearances. In the first stages the caterpillars change from 
their natural, lively green color to a paler green. In a short 
time they have an ashy hue and are sluggish. Immediately 
after death they change to a sooty gray, the body contents 
change to fluid, the skin breaks easily and the dirty fluid becomes. 
smeared over the surface of the leaf. 
That it is a contagious disease we have only indirect proof. 
It has been observed in Illinois and Iowa for the past 10 years. 
aay it seemed to start in warm, dry seasons, in August or 



*U. 8. Div. of Ent. Bull. No. 13, 1886, pp. 50-51. 
