308 INSECTS INFESTING THE POTATO. 



while this part of the remaining segments is greenish-white ; the 

 head is yellowish-brown, usually with a dark dash upon each 

 side. It sometimes assumes the pupa form within its burrow, 

 but it usually enters the earth, where it forms a cell in which to 

 undergo its transformations. The fore-wings of the moth 

 (Fig. 304, 1,) expand from an inch and one line to an inch and 

 six lines ; they are of a mouse gray color, tinged with lilac, 

 and finally sprinkled over with bright yellow scales ; toward 

 the outer edge they are crossed by a yellow^ line. These borers 

 appear from April to August, there being but one annual 

 brood ; the moths are supposed either to hibernate, or to 

 deposit their eggs in the Fall, these not hatching until the fol- 

 lowing Spring ; the first supposition is probably the correct one. 

 Remedy. — Use No. 25. . 



CHAPTER rCVIII. 



The Colorado Potato Beetle. 



{Doryph ora lO-Un eat a . — Say.) 



Order, Coleopetra ; Family, Chrysomelid.e. 



[Feeding upon the leaves of the potato and tomato : a six- 

 legged 3^ellowish grub about six lines long, and marked with 

 two rows of black dots along each side of the body, with the 

 head and legs also black ; finally transforming into a robust 

 yellowish beetle, having a black spot on the head, the thorax 

 covered with dots and short streaks of black, and the wing- 

 cases marked with ten black lines.] 



The egg of this species (Fig. 305a) are deposited in small 

 clusters upon the leaves, and hatch out in the course of 

 about one week. After attaining their full growth the larva^ 

 (Fig. 305i) enter the earth and form small cells in which to 

 undergo their transformations. Several brcKtds arc produced 

 in one year, the last brood passing the Winter in the pupa 

 state (Fig. 305c-). 



Fig. 305. — Colorado Potato Beetle ; a, a, the eggs — color, 

 yellow ; h^ b, b, the larva in difterent stages of its growth — 

 colors, yellow and black ; c, the ]»upa — color, yellow ; d, d, the 

 beetle — colors, 3'ellow and black ; c, one of the wing-cases, 

 enlarged; /, one of the hind legs, enlarged. 



