■ ■I lllll lllll Mill Illl 1111 
THE POTATO TUBER MOTH. 
11 
cases for antennae 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 
&msr^& 
Fig. 8.— Mass of potato tuber-moth pupae. (Original.) 
covered with excrement or debris to such an extent that the white 
silk of the cocoon is seldom visible. The cocoon is therefore more 
nearly tectiform than complete and is generally torn in two when 
the upper part is lifted. As the larva generally seeks some depres- 
sion in which to pupate, this heavier part is seldom more than half 
of the entire cocoon and more often less. 
The covering of the cocoon is generally composed of particles of 
the material surrounding it. 
