118 



INSECTS AFFECTING THE GRAPE. 



depredations are insignificant. The larva (Fig. 54, a). 

 feeds on the decaying roots of various trees, and re- 

 sembles somewhat the common white grub of mead- 

 ows — the larva of the May Beetle. Its general color 

 is whitish, 

 with the head 

 chestn u t - 

 brown. It is 

 supposed to 

 ret [ aire three 

 years to com- 

 plete its de- 

 v e 1 o p ment. 

 When full- 

 grownitforms 

 a sort of co- 

 coon, within 

 w h i c h it 

 changes to the chrysalis or pupa state, to emerge 

 about a fortnight later as an adult beetle. 



The general color of the upper surface of the beetle 

 is a dull yellowish brown, but the thorax is darker, 

 and somewhat bronzed ; and the under surface is of 

 a brilliant metallic greenish-black hue. There are 

 three distinct black dots on each of the wing covers,, 

 and also one on each side of the thorax. The beetle 

 usually feeds upon the foliage of wild and cultivated 

 grape-vines, and also on the Virginia Creeper ; but 

 sometimes attacks green grapes, biting holes through, 

 the skin, and so ruining the fruit. 



Spotted Grape-vine Beetle 



b. pupa: c. beetle. 



a. larva ; 



