PTIL0PH0RA PLUMIGERA. 75 



of a bright, rather yellowish, deep green, semi-trans- 

 parent yet velvety, while the sides and belly are of a 

 tender opaque whitish-green, the twin lines as before 

 low on the sides but now white ; the tubercular warts 

 stand one before the other in pairs on the subdorsal 

 stripes, of which they form a part, being also white ; the 

 segmental folds pale yellow. Soon after this period a 

 dorsal stripe becomes visible for the first time, and is 

 at its first appearance yevy faint and of an obscure 

 whitish character, as though lying deep below the 

 surface. Varieties also now occur which have two 

 transverse bars of white on the twelfth segment and 

 one on the thirteenth, extending over the back from 

 one subdorsal line to the other. 



At the end of May or early in June the larva attains 

 its full growth, which is about an inch and three-eighths 

 to an inch and a half in length, the body plump and 

 cylindrical, rather thicker, however, in the middle than 

 at each end. The head, the lobes of which are rounded 

 and full, is a little less in width than the second seg- 

 ment. The segmental divisions are tolerably indented, 

 and excepting on the thoracic segments there are no 

 subdividing wrinkles on the back, though they are 

 numerous and distinct on the sides, the back is there- 

 fore very smooth. 



In colour the head is a pale transparent yellowish- 

 green. The dorsal stripe of opaque pale blue-green 

 has, by degrees, become wonderfully developed, and is 

 now so broad as to occupy nearly the whole area of the 

 back, there being but a mere line of the previous trans- 

 parent deep yellowish-green left next the subdorsal 

 white stripes, which on the twelfth segment have a 

 tendency upward to a point as though inclined to meet 

 one another there, but return again to their former 

 level and nearly meet at the end of the anal flap. The 

 sides are of a very pale and delicate opaque whitish 

 blue-green with two fine rather wavy-looking white 

 lines nearly parallel along the region of the spiracles. 

 The ventral surface, legs, and prolegs, are of a glossy 



