(52) 



many kinds of borers from burrowing into and destroying 

 their trunks. The larvae of several Capricorn beetles, live 

 entirely in the pine and fir trees, or in timber of these 

 kinds of wood. They undermine the bark in various 

 directions, and even enter the more solid portions of the 

 trunk, having little regularity in its course. Their bur- 

 rows are wide, and as they advance they fill up the hole 

 with a saw-dust like filling. In the eastern states they do 

 immense damage. 



Harris says the Callidium bajulus Linnaeus, one of the 

 most common kinds of Callidium found in Massachusetts, 

 is a flatish, rusty-black beetle, with some downy whitish 

 spots across the middle of the wing-covers. It Measures 

 from four-tenths to three-quarters of an inch in length. 



The Callidium violaceum, Harris, are found just under 

 the bark. When they are about to transform, they bore into 

 the solid wood to the depth of several inches. 



Hylurgus terebrans. OLIVIER. 



(COLEOPTERA. ScOLYTIDvE.) 



The outside appearance of the bark of a pine tree shows 

 no indication of workers on the inside to the casual 

 observer. If, however, during the month of May, we 

 watch closely, small beetles will be seen emerging from 

 the trunk^ through small round holes. Upon raising a 

 part of the bark which is loosened we shall find the 

 under side pierced by these insects. The grubs, or larvae, 

 hatched from the eggs deposited in spring, come to 

 maturity in the autumn, and boring into the bark remain 

 until spring, when they emerge as the perfect insect. They 

 are very small, but when occurring in great numbers, they 

 interrupt the descent of the sap, and prevent the formation 

 of new wood. The tree, after a time, languishes and dies. 

 With this insect has been found another more slender, of 

 a dark-brown color, and clothed with a few short, yellow 

 hairs. " The larvae eat zigzag and wavy passages parallel 



