150 ^^ISC. PUBLICATION 273, U. S. DEPT. OF AGRICULTURE 



Three other species of this genus are found in the Western States 

 doing similar work in various cedarlike trees. 



Species of Trachykele Hosts and distribution 



T. opulenta Fall Incense cedar, big tree, western red cedar, 



and related trees. California, Oregon, 

 and Washington. 

 T. nimhosa Fall Balsam firs and mountain hemlock. Cali- 

 fornia, Oregon, Washington, Idaho, and 

 British Columbia. 

 T. hartmaui Burke Sargent cypress. California. 



Below are listed other western species of wood-boring buprestids 

 that may cause damage of some economic importance : 



Species Hosts 



Poecilonota spp About 5 species which breed in willows and 



poplars. 

 Chrysodothris spp About 26 species in both conifers and 



broadleaved trees. 

 Acmaeodera spp About 18 species in various broadleaved 



trees and shrubs. 

 PolijCGSta spp Three species in broadleaved trees and 



shrubs. 

 (Also see bark-, twig-, or cone-bearing buprestids, pp. 21, 35, 132.) 



THE ROUNDHEADED WOOD BORERS 



(Cerambycidae) ■ 



The roundheaded borers or long-horned beetles {^1) have been 

 previously discussed (p. 134) under the section of miners of the inner 

 bark and cambium region. The western members of this family, 

 however, are much more important from the standpoint of damage 

 to forest products than in the role of killers of living trees. Most 

 of the species are typically cambium-wood insects, in that the larvae 

 first mine in the cambium region of dying or dead trees and then 

 extend their tunnels into the sapwood and in some cases into the 

 heartwood. The large, broadly oval wormholes are a serious defect 

 in lumber, and if these are numerous the wood becomes worthless 

 for lumber purposes. Dying or dead trees, those killed by insects 

 or fire, or trees felled in cutting or by windstorms are most fre- 

 quently selected for attack; and if such timber is not promptly 

 removed from the woods, it may soon be completely ruined for 

 commercial purposes. The salvage of fire-killed trees frequently 

 depends upon the rapidity with which they can be removed from 

 the danger of attack by these borers. Unpeeled logs left in the 

 woods during certain seasons of the year are often seriously 

 damaged. 



There is no way, in which these insects can be controlled in the 

 woods, and there seems little likelihood that practical methods will 

 be developed that will prevent attack on dead or dying trees or 

 recently felled logs. As with other insects that attack unseasoned 

 wood, about the only thing that can be done is to remove the logs 

 from the woods as quickly as possible and place them in water or 

 run them through the mill and kiln-drying process. A few of these 

 insects, however, are of importance even after the lumber is placed 

 in storage. - 



