216 ItfJUKIOUS INSECTS 



quite small and retractile. It is from this peculiar ap- 

 pearance of the fore part of the body, which strikingly 

 suggests the fat cheeks and shoulders and small head of 

 some breeds of swine, that it may best be known as the 

 Hog-caterpillar of the vine. The color of this worm 

 when full grown is pea-green, and it is wrinkled trans- 

 versely and covered with numerous pale-yellow dots, 

 placed in irregular transverse rows. An oblique cream- 

 colored lateral band, bordered below with a darker green 

 and most distinct on the middle segments, connects with 

 a cream-colored subdorsal line, which is bordered above 

 with darker green, and which extends from the head to 

 the horn at the tail. There are five and often six some- 

 what pale-yellow trian- 

 gular patches along the 

 back, each containing a 

 lozenge-shaped lilac-col- 

 ored spot. The head is 

 small, with yellow granu- 



Fig. 137. CHRYSALIS OF HOG-CATER- 

 PILLAR, dicular yellow lines, and 



the stigmata or spiracles 



are orange-brown. When about to transform, the color of 

 this worm usually changes to a pinkish-brown, the darker 

 parts being of a beautiful mixture of crimson and brown. 

 Previous to this change of color Mr. J. A. Lintner has 

 observed the worm to pass its mouth over the entire sur- 

 face of its body, even to the tip of its horn, covering it 

 with a coating of apparently glutinous matter the oper- 

 ation lasting about two hours. Before transforming into 

 the pupa or chrysalis state, it descends from the vine^ 

 and within some fallen leaf or under any other rubbish 

 that may be lying on the ground, forms a mesh of strong 

 brown silk, within which it soon changes to a chrysalis 

 (fig. 137) of a pale, warm yellow, speckled and spotted with 

 brown, but characterized chiefly by the conspicuous dark 



