Insects Injurious to the Potato and Apple. 599 



the larval state that these insects injure the trees. The per- 

 fect insect is shaped much like the blistering beetles. One 

 of the commonest of these, and one often occurring in 

 this State, is a striped beetle Sa/perda bivittata, Say. 



Fig. 10. 



b c 



ROUND-HEADED APPLE-TREE BORER— SAPERDA BIVIT- 



TATA, Say. 

 a, larva full yrown ; b, pupa; c, perfect beetle. 



It is about three-fourths of an inch long, of a light brown 

 color, with a broad wliite stripe running through the middle of 

 each wing cover (tig. 1 0, c). The larva (fig. 10, a,) is about one 

 inch long, light yellow, with a darker spot on the first joint, 

 and a hard, smooth brown head, with black jaws. In this stage 

 it is often called the round headed borer. The eggs are laid in 

 June, near the base of the tree, and in about two weeks 

 they hatch, and the young worms immediately begin to bore 

 into the wood. According to Kiley, it lives during the 

 first year in the sap wood, in the fall coming down as near 

 the ground as possible, and remaining torpid until spring ; 

 during the next year it works still in the sap wood, and is 

 about half grown. Riley thinks that at this time it does 

 most mischief, and that if there are four or five of them in 

 one tree they will completely girdle it. During the next 



