208 



NEBRASKA STATE HORTICULTURAL SOCIETY. 



fest the sweet potato both in the larval and beetle state, a slight knowl- 

 edge of each will not be amiss to the gardener. Their mode of attack 

 is to gnaw irregular holes in the leaves from below. The time of 

 greatest abundance is during the months of May and June. Several 

 broods are reared annually; and the beetles hibernate under various 

 shelters, as leaves, grasses, sticks of wood, pieces of bark, boards, cow 

 droppings, etc. 



THE TWO-STRIPED SWEET POTATO BEETLE. 



(Cassida bivittata Say.) 



Our commonest species of these beet- 

 les in Nebraska is the one shown in the 

 accompanying illustration (Fig. 18). 

 It is dirty yellow with two black lines 

 upon each elytron or wing cover, as 

 shown in the figure at 4. The larva is 

 fig. is.- The Two-Striped Sweet Po- dirty white or yellowish white, with a 



tato Beetle (Cassida bivittata); 2, larva; J J , 



3, pupa ; 4, imago. [After kiiey.] more or less distinct blackish line along 



its back, usually bordered on each side by a narrow one of a lighter 

 shade than that of the body. It also differs from the larvae of all 

 the others of our species in lacking the shield of excrement common 

 to them. 



Another of these beetles is what is known as the 





- ■& 





?v&& 



1 



GOLDEN TORTOISE BEETLE. 

 {Coptocycla aurichalcea Fabr. ) 

 This insect is shown in Figs. 19 and 20. It is our next common- 



$%M 



m 



Fig. 19 — The Golden Tortoise Beetle (Cop to- 

 cyda aurichalcea): a, leaves with larvae ; b, larva 

 — enlarged. [Alter Riley.] 



Fig. 20 — The Golden Tortoise 

 Beetle (Coptocycla aurichalcea); 

 c, pupa ; d, beetle — enlarged. 

 [After Riley.] 



est species upon the sweet potato, and also occurs in equal abundance 

 upon the wild morning glories, as well as on the bitter-sweet and sev- 



