246 



INSECTS INJURIOUS TO THE GRAPE. 



along the sides of the body these granulations are so arranged 

 as to form a series of seven oblique stripes, extending back- 

 wards, and margined behind with a darker green. A white 

 lateral stripe with a dark-green margin extends from just 

 behind the head to the horn near the other extremity. Along 

 the back are a series of seven spots, varying in color from 

 red to pale lilac, each set in a patch of pale yellow. The 

 caudal horn is one-fitth of an inch long, and varies in color 

 from reddish to bluish green, granulated with black in front, 

 and sometimes yellow behind and at the tip. This larva 

 has the power of drawing the head and next two segments 

 Avithin the fourth and fifth, causing these latter to appear 

 much distended; the feet are red, the prolegs pale green. 

 Some specimens, especially among those of the later brood, 

 will be found exhibiting remarkable variations in color ; 

 instead of green they assume a delicate reddish-pink hue, with 

 markings of darker shades of red and brown, which so alter 

 their appearance that they might at first sight be readily 

 taken for a different species ; a careful comparison, however, 

 will show the same arrangement of dots and spots as in the 

 normal form. 



When full grown, the larva descends from the vine and 

 draws a few leaves loosely together, binding them with silken 

 threads, usually about or near the base of the vine on which 



it has fed, and within this 

 rude structure changes to a 

 chrysalis (see Fig. 254) of a 

 pale-brown color, dotted and 

 streaked with a darker shade, 

 and with a row of oval dark- 

 brown spots along each side. 

 The moths from this first brood of larvse usually appear 

 during the latter part of July, when they deposit eggs for a 

 second brood, which mature late in September, pass the winter 

 in the pupa state, and emerge as moths in the following May. 

 The wings of this insect, when fully expanded, measure 



Fig. 254. 



