THE POTATO TUBER MOTH. 



11 



cases for anteimse and legs fold closely on the venter and are rather in- 

 conspicuous. The wing cases are also closely folded and generally 

 reach the distal end of the fourth abdominal segment. The tips of 

 the wing cases and the eyes are darker in color. All the segments of 

 the abdomen are armed with a few weak hairs, and the anal segment, 

 aside from its short, stout dorsal hook, bears many light hooked 

 spines arranged in a circle. 



THE COCOON. 



The cocoon (fig. 9) is white, rather loosely woven, and very thin. 

 The exposed portion is more tightly woven and much thicker, and is 



J'iG. 8. — Mass of potato tubtT-moth pupa3. (Original.) 



covered with excremoiit or (lc})ris to such an extent that the white 

 silk of the cocoon is seldom visible. The cocoon is therefore more 

 nearly tectiform than rompleto aTid is generally torn in two when 

 the upper part is liftfid. As the larva generally scuiks some depres- 

 sioii in which to pupates, tliis heavier part is seldom more tlian Jiall" 

 of the entire cocoon and more often less. 



Tli(» covering of ilics cocoon is generally composed of j)iuticlcs of 

 tlic material siiiiouii(liii<' it,. 



