220 
THE STUDY OF INSECTS . 
from the lower end, and Figure 251 the fully developed 
male. These figures are of one of our smaller species, 
which belong to the genus Psyche (Psy'che). 
Abbot's Bag-worm, Oiketicas abbotii (Oi-ket'i-cus ab- 
bot'i-i).—This species occurs in the more southern part of 
our country. The larva makes a bag with sticks attached 
to it crosswise (Fig. 249). 
The Evergreen Bag-worm, Tliyridopteryx ephemer&for - 
mis (Thyr-i-dop'te-ryx e-phem-e-rae-for'- 
mis).—This is our best known species, 
and on this account has been commonly 
called The Bag-worm. But as it is desir¬ 
able to have different names for the dif¬ 
ferent species, we call this one the Ever- 
Fig. 252 .— Thyridofiteryx * r ... , , , 
tphent er a form is. green Bag-worm ; for although it feeds on 
many different trees, it prefers red cedar and arbor vitae. The 
bag of this species 
is about the same size 
as that of Abbot’s 
Bag-worm; but it dif¬ 
fers in being covered 
with bits of leaves of 
cedar or arbor vitae, or 
with twigs attached 
lengthwise. 
The structure of 
the wings of the Psy- 
chidae is very char¬ 
acteristic (Fig. 253). 
Both the fore and 
the hind wings may 
have either two or ^IG. 253, —Wings of Thyridopteryx ephemertefortnis. 
three anal veins ; but the anal veins of the 
fore wings are grown together so as to ap¬ 
pear as a single much-branched vein. The 
Fig. 254. base of vein V is preserved and is forked 
