10 
sons, that our people should be fully informed and carefully in- 
structed in advance in order that the first of these insects to appear 
may be detected and destroyed without delay. 
The brown-tail moth is a caterpillar (Fig. 13) in the destruc- 
tive stage, and, of course, goes thru the four stages of egg, larva, 
pupa, and adult. It is easily distinguished in the last of these stages 
Fig. 13. Brown-tail 
Moth, Euproctis chry>- 
orrh(xa, larva. Natural 
size. (Massacbusetts 
Experiment Station.) 
Pi^. 14. Brown-tail Moth, Eu- 
proctis chrysorrhaa. Slightly en- 
larged. (Massachusetts Experi- 
ment Station.) 
from any American insect by the character to which it owes its 
name of "brown-tail," namely, a thick brushlike tuft of orange- 
brown hairs at the tip of the abdomen, especially in the female 
(Fig. 14). Otherwise both sexes are pure white thruout, except 
that occasionally there may be a few black spots on the fore v>'ing of 
tlie male. They measure about an inch and a quarter from tip to 
tip of the expanded wings. Any pure white moth of approximate- 
ly this size with an orange-brown tuft of hairs at the tip of the 
abdomen may be at once set down as the brown-tail; and any one 
seeing it in Illinois will render a notable public service by reporting 
the fact promptly to the State Entomologist, at Urbana, 111. 
The winter nests of these caterpillars are also easily identi- 
fied, since no native Illinois species hibernates on either tree or 
shrub in colonies of living caterpillars inclosed in a web. Any 
such cluster of young caterpillars so protected by a common web 
may consequently be set down at once as the brown-tail and should, 
of course, be promptly destroyed and the facts reported to the 
Entomologist. Nurserymen importing European seedling stock can 
