CO LEO PT ERA 



163 



The locust-trees have been completely destroyed in some localities 

 by the depredations of these larvae. 



The painted hickory-borer, Cyllene caryce. — This beetle resembles the 

 preceding so closely that the same figure will represent either. But the 

 hickory-borer not only infests a different kind of tree, but appears in 

 the spring instead of the autumn. In this species the second segment of 

 the hind tarsus is densely pubescent beneath, while it is glabrous in the 

 locust-borer. 



Fig. 286. 



THE LAMIIDS 



As in the preceding group, the prothorax is rounded with these 

 beetles; but the lamiids are distinguished by having the fore tibia? 

 obliquely grooved on the inner 

 side, and the last segment of the 

 palpi cylindrical and pointed. 

 The following are some of the 

 more important species. 



The sawyer, Monochamus 

 notatus. — This beautiful brown- 

 ish-gray beetle is about 1 ^ inches 

 long, with antennae as long as 

 the body in the case of the fe- 

 male and twice as long in the 

 case of the male (Fig. 286). 

 The larva bores in the sound 

 wood of pine and of fir, making, 

 when full-grown, a hole h inch 

 in diameter. The pupal state 

 is passed within the burrow. It sometimes occurs in such numbers as 

 to kill the infested trees. 



The round-headed apple-tree borer, Saperda Candida. — Excepting 

 the codling-moth, which infests the fruit, this is the worst enemy of the 

 apple that we have. Its common name is used to distinguish it from the 

 flat-headed apple-tree borer, already described, the larva of this species 

 being nearly cylindrical in form (Fig. 280). The eggs are laid on the 

 bark of the trunk of the tree late in June or July. The larva at first 

 bores in the soft sap-wood, making a disk-shaped mine; after this it 



works in an upward direction in the harder 

 wood, and at the close of its larval existence 

 comes to the surface several inches above the 

 place it entered. It requires nearly three 

 years for this larva to attain its growth; it 

 changes to a pupa, near the upper end of its 

 burrow, about the middle of May, and emerges 

 as a beetle in June. The beetle (Fig. 287) is 

 of a pale brown color above, with two broad 

 white stripes extending the whole length of the 

 body. Although the larva is found chiefly in 

 apple, it infests many other trees. The presence of the borers can be de- 

 tected by the sawdust-like castings which the larvae throw out at the 

 entrances of their burrows. 



Fig. 287. 



