DESCRIPTION OF THE LIFE STAGES 



119 



two prolegs at the head end of the body. The head is dark 

 bluish, and the body in general has a bluish appearance, more 

 or less modified by the longitudinal series of marks and stripes. 

 Along the middle of the back there is a series of whitish or 

 cream-colored marks of the shape shown in Fig. 47 a. Along 



Fig. 47. — Forest Tent Caterpillar ; a, markings on one ring of the back ; J, markings 

 on one ring of the side. 



the upper part of each side there is a broad blue stripe, bordered 

 above and below by a narrow, irregular, yellowish-white line. 

 On the lower surface the color is bluish black. The whole 

 body is sparsely clothed with rather short hairs. 



Cocoon. — When the cocoon is not made within a leaf, the loose 

 outer silk varies greatly in the area occupied. An average 

 size would be about one and three-fourths inch long by one 

 inch wide. The inner firmer part of the cocoon is generally a 

 little less than one and one-fourth inch long by one-half inch 

 wide. The inner cocoon is. colored yellow by the material 

 voided by the caterpillars just before pupation, but the outer 

 fluffy silk is generally wMte, because it is not reached by the 

 yellow liquid. As already stated in a previous paragraph, 

 when the cocoon is made within a leaf its outer appearance 

 varies greatly, according to the material employed. 



Pupa. — The pupa is the dull brown, mummy-like object to 

 be found within the cocoon. It has neither legs nor wings, 

 and is unable to move otherwise than by a wriggling motion 

 of its body. The pupa that is to develop into a female moth 



