THE CANADIAN ENTOMOLOGIST. 



179 



Fig. 21. 



early in July, when the infested grapes show a discolored spot where the 

 worm has entered. [See fig. 21, c] When the grape is opened and the 



contents carefully ex- 

 amined there will usually 

 be found in the pulp a 

 small larva rather long 

 and thin, and of a whitish 

 green color. Besides 

 feeding on the pulp it 

 sometimes eats portions 

 of the seeds, and if the 

 contents of a 'ingle 

 berry are not sufficient, two, three, or more are drawn together as s lown 

 in the figure and fastened with a patch of silk mixed with castings, 'vhen 

 the larva travels from one to the other, eating into them and dev( nring 

 their juicy contents. At this period its length is about an eighth c f an 

 inch or more ; the head is black and the next segment has a bla< kish 

 shield covering most of its upp(;r portion ; the body is dull whitish or 

 yellowish green. As it approaches maturity it becomes darker in colour 

 and when about one third of an inch long is full grown, see ^, figure 21. 

 The body is then dull green with a reddish tinge and a few short hairs, 

 head yellowish green, shield on next segment dark brown, feet blackish, 

 pro-legs green. 



When the larva is full grown it is said to form its cocoon on the leaves 

 of the vine, cutting out for this purpose an oval flap, which is turned back 

 on the leaf forming a snug euclosure which it lines with silk ; frequently 

 it contents itself with rolling over a piece of the edge of the leaf, and 

 within such retreats the change to a chrysalis takes place. The chrysalis 

 is about one fifth of an inch long and of a yellowish or yellowish brown 

 color, from which the moth finally escapes. 



The perfect insect which is shown magnified, a, figure 21, measures 

 when its wings are spread nearly four-tenths of an inch across. The fore 

 wings are of a pale, dull, bluish shade with a slight metallic lustre, be- 

 coming lighter on the interior and posterior portions and ornamented 

 with dark brown bands and spots. The hind wings are dull brown, 

 deeper in color towards the margin, body greenish brown. It is said 

 that there are two broods of this insect during the year. We have never 



