40 



ViG.S?.—Chrysobnthrisfemorata: o, larva; 6, beetle; 

 c, head of male; d, pupa, enlarged. (Chitten- 

 den.) 



a little, and then pupate. Winter is passed in this condition, and in 

 June the beetles out circular holes in the bark and escape. It thus 

 takes three years to reach maturity. This borer also infests pear and 

 quince, but not so frequently as the apple. 



THE FLAT-HEADED APPLE-TREE BOREK. 



{Chrysohothris femoraia Fab. — fig. 37.) 



Discolored spots like those caused by the round-headed borer may 

 indicate the presence of this insect. They are, however, often found 



farther up the trunk, and even on 

 the larger branches. The adult is 

 a dark, metallic beetle, rather flat, 

 and about one-half inch in length. 

 The female deposits her eggs in 

 crevices of the bark on the south 

 side of the tree, usually during 

 June and July, but sometimes 

 later. They apparently' prefer 

 trees that are weak or dying, but 

 also attack healthy ones. The 

 young larva upon hatching eats 

 through the bark and bores be- 

 neath the surface; leaving a flattened burrow filled with its frass. 



Sometimes, when more mature, they bore deeper into the sapwood. 



The full-grown larva is nearly an inch in length, pale yellowish in 



color, with the segment next to the head greatlj^ enlarged and flattened. 



In the spring it bores out nearly through 



the bark, then moves back a little and 



pupates. In about three weeks the beetle 



cuts an elliptical hole in the bark and 



escapes. There is one brood each year. 



It attacks apple, pear, cherry, plum, and 



quince. 



THE SINUATE PEAR BORER. 

 {Agrilus sinuatus Oliv. — figs. 38 and 39.) 



The larva of this insect bores long, sinu- 

 ate galleries beneath the bark and sapwood 

 of pear, killing the wood and causing the 

 bark above to crack. The elongate bronzy 

 beetle makes its appearance in May or early June, and lays its eggs 

 in crevices of the bark. The slender, whitish larva burrows beneath 

 the bark, always downward. In the fall the larva becomes dormant, 

 and is then about 1 inch long, quite flat, whitish or yellowish in color. 



Fig. SS.—Agi-Um sinualiiK: i, 

 6, beetle; r, pupa, enlarged, 

 nal.) 



larva; 

 (Origi- 



