DESCRIPTION. 



19 



and properly sprayed vineyards are less subject to the attacks of 

 insects. Such infestations are very frequently the direct outcome of 

 neglect in the general care of vineyards, as is more fully considered 

 elsewhere in this bulletin. 



DESCRIPTION. 



THE EGG. 



(PI. I, 



3-4.) 



The eggs of the grape 

 root-worm beetle are small 

 yellowish - w^hite objects, 

 measuring 1.15 mm. in 

 length and are about one- 

 third as broad as long. In 

 form the egg is cylindrical, with the two ends almost hemispherical. 

 As the shell is very flexible and the eggs are generally laid crosswise 

 on the canes, they often assume a slightly curved shape. Through 

 the semi transparent shell the segmentation of the embryo can be 

 seen, and later, as the young larva attains its full development, the 



Fig. 8. — The grape root- worm (i^idza viiicida). Larva: 

 Side view of full-grown larva; b, front view of head; c, 

 maxillse and labium. Much enlarged. (Original.) 



Fig. 9. — The grape root-worm. Pupa: a, Upper view; b, lower view; c, normal position of pupa in 

 cell; c, d, showing the pupa supported by the spines in the cell; e, hind part of body, showing 

 terminal spines. Much enlarged. (Original.) 



head with the dark-colored mandibles becomes clearly visible. Prof. 

 F. M. Webster observed the larva backing out from the eggshell in 

 the process of hatching. 



THE LARVA. 



(PI. I, figs. 5-6; text fig. 8.) 

 The full-grown larva varies in length from 8 to 10 mm. 



It is 



whitish, with the head, thoracic shield, and spiracles pale birown. 



