572 
THE STUDY OF INSECTS . 
row a short distance, and builds a plug of chips below it. 
The autumn winds break the branch from the tree. The 
larva remains in its burrow through the winter, and under¬ 
goes its transformations in the spring. No one has ex¬ 
plained its object in severing the branch. The adult is a 
plain, brownish-gray beetle. Whenever it becomes abun¬ 
dant its increase can be checked by gathering the fallen 
branches in the autumn and burning them before the beetles 
have escaped. 
Subfamily Lamiinas (Lam-i-i'nae). 
The Lamiids (Lam'i-ids). 
As in the preceding subfamily, the prothorax is rounded 
with these beetles; but the Lamiids are distinguished by 
having the fore tibiae 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, Monokammus confusor (Mon-o-ham'mus 
con-fu'sor).—This beautiful brown and gray beetle is about 
an inch and a quarter long, with antennae as long as the 
body in the case of the female and twice as long in 
the case of the male (Fig. 696). The larva bores in 
the sound wood of 
pine and of fir, mak¬ 
ing a hole, when 
full grown, one half 
inch in diameter. 
The pupa state is 
passed within the 
burrow. It some¬ 
times occurs in such 
numbers as to kill 
the infested trees. 
The Round- 
headed Apple-tree 
Fig. 696. 
