210 



N. H. AGR. EXPERIMENT STATION. 



[Bulletin 139 



markings, but the larger ones become quite varied in color, some 

 being uniformly yellowish with black and yellow tubercles, while 

 others have a dark stripe running down the back and appear 

 almost black. (Figure 3, a, b). 



Cocoon and Pupa. — The mature caterpillar finds a secluded 

 corner under the bark of the tree, or the rubbish at its base, in a 



Fig. 3. Fall Webworm ( Hyphantria cunea Den.) a. liRht form of full-Krowa 

 larva ; 6. dark form of same ; c. pupa; d. spotted form of moth— all -slightly en- 

 larged. (After Howard, U. S. Dept. Agr.) 



fence corner, under the eaves or in the cracks of a building, or 

 sometimes just under the surface of loose soil, and there spins 

 its cocoon. Very frequently the old cocoon of some other moth 

 is utilized or practically no cocoon is made. The cocoon is a 

 flimsy affair at best, merely a thin covering of silk with which 

 the caterpillar mingles some of its hairs as it spins the cocoon. 

 Within it the caterpillar sheds its skin for the last time, having 



