THE LOCUST-TREE BORERS. 
411 
by the 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 
successful 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 Clytus pictiis^ the paint¬ 
ed Clytus, 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. 
is reddish above, and white beneath, with 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 nearly 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 through the solid wood, enlarging 
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 web 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- 
