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, 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). 



The Evergreen Bag-worm, Thyridopteryx ephemercefor- 

 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- 



FlG. 252. — ihyridopteryx A 



ephememformis. 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 f , 

 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 ephemerceformis. 



three anal veins ; but the anal veins of the 



fore wings are grown together so as to ap- 



m pear as a single much-branched vein. The 



Fig. 254. k ase f ve { n y j s preserved and is forked 



