FOURTH REPORT 
Of the Colorado giologieal 
Association. 
EDITED BY THE SECRETARY. 
NEW MEMBERS. 
(23.) Rev. Geo. D. Hulst, Editor 
of “Entomologica Americana,” 15 
Himrod street Brooklyn, N. Y. 
(24.) Lord Walsingham, M. A., F. 
R. S., Merton Hall, Thetford Eng- 
land. 
THE LIBRARY. 
We have to acknowledge with 
thanks the volumes of “Ornithologist 
and ologist” for 1887 and 1888 from 
Mr. Charles F. Morrison; and copies 
of 36 valuable papers from Prof. A. S. 
Packard, M. D. In the library cat- 
alogue which we hope to publish later 
on, these and other works in the pos- 
session of the Association will be 
enumerated in detail. Thanks are al- 
so due to the Rev. Geo. D. Hulst, for 
a MS- list of the Sphingidae, Catocalae, 
Geometrae, Pyralidae, and Tortricidae, 
of Colorado, compiled from published 
records, and to Mr. Wm. Beutenmul- 
ler for notes on the Lepidoptera re- 
corded from Colorado in Bull. VI of 
Haydens survey. 
INJURIOUS INSECTS OF CUSTER COUNTY. 
The Tent Caterpillar (Clisiocam- 
pa.) — The tent-caterpillar of Custer 
county, is perhaps not to be consider- 
ed an injurious insect at all, since its 
attacks are apparently confined to 
the quaking asp trees, and are not so 
serious as to attract much notice. It 
has been reported, however, that in 
past years caterpillars have done much 
damage to the quaking asps, and it is 
by no means improbable that these 
were tent caterpillars, though no pos- 
itive evidence is forthcoming. Nev- 
ertheless, in other parts of the country, 
where fruit trees are grown, these same 
tent caterpillars are a seriouspest to 
be .reckoned with, and require to be 
constantly destroyed to save the trees 
from almost complete defoliation. 
The tent caterpillars are about an 
inch and a half in length, and are 
dull in color, and covered with short 
hairs. The head is bluish grey. 
They spin webs in the branches of 
trees, in which they live, devouring 
the foliage with great voracity, so that 
if they are numerous the trees are 
stripped as if in winter. When ma- 
ture, they spin long oval cocoons, not 
altogether unlike those of the silk- 
worm, to which they are somewhat 
allied. From these come dull brown 
stout^bodied moths, which will be 
recognised by their hairiness, and 
their feather-like antennae. The eggs 
are laid close together in rings or 
bracelets round twigs and small 
branches, and from each batch of 
eggs there issues a colony of caterpil- 
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