INSECT ENEMIES OF WESTERN FORESTS 189 



varnish sometimes is repeatedly attacked until the interior is 

 completely riddled and destroyed. If the wood is very dry, it takes 

 many years for the larvae to complete their development — rear- 

 ings indicate more than 10 years — and many records of emergence 

 from wood in houses indicate from 10 to 26 years (103). B. langi 

 Mann. (fig. 87, A) is a bright-green species which has the same 

 habits as the golden buprestid and is found attacking Douglas-fir 

 throughout the Pacific coast and Rocky Mountain regions. 



Ten other species in this genus of highly colored beetles do simi- 

 lar damage to the wood of western forest trees (fig. 87) . They are 

 as follows : 



Species of Buprestis Hosts and distribution 



adjecta (Lee.) (fig. 87, F) . . . Ponderosa, lodgepole, and possibly other pines; 



Douglas-fir and red fir. Western States. 



Uncommon. 

 confluenta Say (fig. 87, G) . . Poplar and aspen. Western States. Uncommon. 

 connexa Horn (fig. 87, E) . . Ponderosa and Jeffrey pine. Pacific coast and 



Idaho. Rare. 



gibbsi (Lee.) Oak. Pacific coast. Rare. 



intricaia Csy Lodgepole pine. California, Wyoming, Colo- 

 rado, New Mexico, and British Columbia. 



Uncommon. 

 nuttalli (Kby.) (fig. 87, /) . . Ponderosa pine and Douglas-fir. Pacific coast. 



Rocky Mountain States, and in the East. 

 niittali subsp. laeviventris 



(Lee.) (fig. 87, H) Pines and Douglas-fir. Western States. Common. 



rusticorum (Kirby) 



(fig. 87, C) Fir, Douglas-fir, and pines. Western States. 



Common. 

 suhornata (Lee.) (fig. 87, D) Ponderosa and lodgepole pines. Western States. 



Uncommon. 

 viridisuturalis N. & W Poplar, cottonwoods, and alder. California, 



Oregon, and Washington. Common. 



ff'f 



Figure 88. — Adults of a flatheaded wood borer, Dicerca tenebrosa. 

 Natural size. 



The dicerca beetles, members of the genus Dicerca (fig. 88), are 

 medium-sized, robust, roughly sculptured, metallic, wood-boring 

 beetles of a dull bronze color, with the tips of the wing covers 

 prolonged into narrow points. The larvae work under the bark 

 and into the wood of various species of trees that are sickly, dying, 

 or dead. Of the 10 species recorded from the Western States, those 



