OF THE FARM AND GAEDEN. 105 



numerous entirely riddle the leaves. They usually dwell 

 on the underside of the leaves, and are found most 

 abundant during the months of May and June. There 

 must be several broods during the year, and the same 

 species is often found in all stages, and of all sizes at one 

 and the same time. In all probability they hibernate in 

 the beetle state. 



AVe have already proved by experiment that Paris 

 Green — one part of the Green to two of flour — when 

 sprinkled under the vines, will kill these insects, though 

 not so readily as it does the Colorado Potato-beetle. 

 Moreover, as these Tortoise-bettles usually hide on the 

 underside of the leaves, and as the vines trail on the 

 ground, it is very difficult to apply the powder without 

 running some risk from its poisonous qualities. We 

 therefore strongly recommend vigilance when the plants 

 are first planted, and by the figures and descriptions given 

 below our readers will be enabled to recognize and kill 

 the few beetles which at that time make their appearance, 

 and thus nip the evil in the bud. 



THE TWO-STRIPED SWEET-POTATO BEETLE. 

 (Cassida bivittata, Say.) 



This is the most common species found upon the 

 Sweet-potato, and seems to be confined to that plant, as 

 we have never found it on any other kind. The larva 

 of this beetle, which is given in figure 71, 2, enlarged, and 

 in figure 70, of natural size, is dirty-white or yellowish- 

 white, with a more or less intense neutral-colored lon- 

 gitudinal line along the back, usually relieved by an 

 extra light band each side. It differs from the larvse of 

 all other known species in not using its fork for merdig- 

 erous purposes. Indeed, this fork is rendered useless as a 



