194 MISC. PUBLICATION 273, U.S. DEPT. OF AGRICULTURE 



Figure 90. — The spotted pine sawyer (Monochamns maculosus) , males. 



Natural size. 



scorched, dying, or recently felled pines and Douglas-fir through- 

 out the Western States. 



The Oregon fir sawyer (Monochamus oregonensis Lee.) (fig. 91) 

 is a stout, black beetle, approximately y 2 to 1% inches long, with 

 gray markings, antennae about twice as long as the body, and a 

 toothlike projection on each side of the prothorax. The larvae 

 range from 1 to 1% inches in length and are destructive to fire- 

 scorched, injured, dying, or recently felled Douglas-fir, true firs, 

 and pines of the Western States. This is the western variety of 

 the eastern white-spotted sawyer (M. scutellatus Say). 



The obtuse sawyer (Monochamus obtusus Csy.) is a small brown 

 beetle with gray markings, measuring from y 2 to % inch in length. 

 The antennae are over twice as long as the body, and the prothorax 

 has a toothlike projection on each side. The larvae are from 1 to 

 iy 2 inches long and are destructive to pine, Douglas-fir, and fir in 

 the Pacific Coast States, British Columbia, and Idaho. 



The black-horned pine borer (Callidium antennatum var. hes- 



Figure 91. — The Oregon fir sawyer (Monochamus oregonensis) : A, Male: 

 B, female. Natural size. 



