236 



INJURIOUS INSECTS 



growth of the vines that the worms come out in full force 

 before the third bunch has fully formed, and this bunch 

 is consequently included in the fold made by these 

 worms, and destroyed. 



The larva of the Grape-vine Plume invariably hatches 

 very soon after the leaves begin to expand; and though it 

 is very generally called the Leaf-folder, it must not be 



confounded with the true 

 Leaf -folder, described on page 

 231, and whicb does its prin- 

 cipal damage later in the 

 season. At first the larva 

 of our Plume is smooth and 

 almost destitute of hairs, but 

 after each moult the hairs 

 become more perceptible, and 

 when full grown the larva 

 appears as at figure 144, a, 

 the hairs arising from a trans- 

 verse row of warts, each joint 

 hEJf jjjjjjL having four above and six 

 W^f Afii below the breathing pores 

 %S ejB (see fig. 144, e). After feed- 

 11(11 ^fpjp^ ing for about three weeks our 

 little worm fastens itself se- 

 Fig. 144. GRAPE-VINE PLUME (Rer- curely by the hind le^s to the 



phorus pcriscdidactylus, Fitch.) -, i , <. 



a, Larva; fc, pupa? c, Horn; d, Moth; underside oi some leaf or 



other object, and, casting 



its hairy skin, transforms to the pupa state. The pupa 

 (fig. 144, #), with the lower part of the three or four 

 terminal joints attached to a little silk previously spun 

 by the worm, hangs at a slant of about forty degrees. 

 It is of peculiar and characteristic form, being ridged 

 and angular, with numerous projections, and having 

 remnants of the larval warts; it is obliquely truncated 

 at the head, but is chiefly distinguished by two com- 



