22O 



THE STUDY OF INSECTS. 



II 



III, 



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 ephemerafor- 

 inis (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- 

 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 vitas, 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 



either tWO Or ^ r ' G- 2 ^' Wings of Thyridopteryx epheitrc?formis. 



three anal veins ; but the anal veins of the 

 fore wings are grown together so as to ap- 

 111 pear as a single much-branched vein. The 

 base of vein V is preserved and is forked 



