THE PINE BORER OR '' SAWYER," 



693 



head). This segment is transversely oblong, being as wide in front as behind • it is 

 a little more than twice as wide as long. The head is large and square, not narrow- 

 ing m front, but as wide anteriorly as posteriorly. When the head is forcibly pulled 

 out It IS found to be as long as broad ; anterior one-fourth of head, deep mahogany 

 red becoming blackish on the edge. Clypeus very short and broad, about four times 

 as broad as long. Labrum rather wide, not much contracted at base, rounded in 

 front, with very stout bristles on the margin. Mandibles gouge-like, the ends 

 oblique, hollowed out, with the outer edge produced into a point. Antenn* very 

 minute, three-jointed, the second and third joints about as long as the basal The 



F<5!5£* 



^ J.> r I .\^ J 1 SK/ll( 



r 



6- 



pi. 



K 





\ / . ^\ ^ /Mr/ 'k'l'/i 



Fig. 230.-Monohammua confusor, bark showing exit perforations of 

 mature beetles. (Original.) 



maxill* form a basal joint, throwing off a three-jointed palpus, and an inner lobe 

 armed with stiff bristles, reaching to the end of the second joint of the palpus. The 

 ^-jointed labial palpi reach to as far as the middle of the brush-like lobe of the max- 

 ilL-e; the second joint is about as long, but half as wide, as the basal. The middle 

 of each segment, especially the third to the seventh above and below, with a trans- 

 verse callous spot. The upper side of the first abdominal segment has a very narrow 

 oblong square area impressed upon it. The callous spot is best marked on the iifth 

 segment, consisting of an area about one-third as long as broad, with a square, shal- 



