THE LOCUST-TREE BORERS. 411 



by tlie caterpillar, are weaker than the rest of the stem, 

 which therefore easily breaks off at these places. My at- 

 tempts to complete the history of this insect have not been 

 successftil hitherto. 



The second kind of borer of the locust-tree is larger 

 than the foregoing, is a grub, and not a caterpillar, which 

 finally turns to the beetle named Clytas pictiis, the paint- 

 ed C'lytus, already described on a preceding page of this 

 work. 



The third of the wood-eaters to which the locust-tree is 

 exposed, though less common than the others, and not so 

 universally destructive to the tree as the painted Clytus, is a 

 very much larger borer, and is occasionally productive of great 

 injury, especially to full-grown and old trees, for which it 

 appears to have a preference. It is a true caterpillar (Fig. 

 203), belonging to the tribe of moths under consideration. 



Fig. 203. 



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is reddish above, and Avhite beneath, Avith the head and top 

 of the first ring brown and shelly, and there are a few short 

 hairs arising from minute warts thinly scattered over the 

 surface of the body. When fully grown, it measures two 

 inches and a half, or more, in length, and is neai'ly as thick 

 as the end of the little finger. These caterpillars bore the 

 tree in various directions, but for the most part obliquely 

 upwards and downwards throuo-h the solid wood, enlaro-inrr 

 the holes as they increase in size, and continuing them 

 through the bark to the outside of the trunk. Before trans- 

 forming, they line these passages with a Aveb of silk, and, 

 retiring to some distance from the orifice, they spin around 

 their bodies a closer web, or cocoon, within which they 

 assume the chrysalis form. The chrysalis (Fig. 204) meas- 



