220 



THE STUDY OF INSECTS. 



FlG. ziyi 



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, Oiketicus 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). 



T'ie Evergreen Bag-worm, TJiyridopteryx ephenieratfor- 

 mis (Thyr-i-dop'te-ryx e-phem-e-me-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- 

 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 FlG - 2 S3- Wings of rhyridopteryx ephemeraformis. 



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 

 base of vein V is preserved and is forked 



FIG. 254. 



