46 MISC. PUBLICATION 6 9 8, U. S. DEPT. OF AGRICULTURE 



Head with front and clypeus sparsely, coarsely granulose, sparsely 

 clothed with rather long, arcuate semierect hairs, the clypeus glabrous 

 and smooth along anterior margin; mentum subtruncate in front. 



Pronotum strongly, uniformly convex, widest near middle; sides 

 broadly rounded, coarsely tuberculate along margins ; surface sparsely 

 clothed with short, recumbent, yellowish hairs on disk, the hairs longer 

 and more erect at sides, densely, coarsely granulose, the granules on 

 basal half strongly elevated, and distinctly separated from one an- 

 other, apical half with numerous broad, strongly elevated teeth, which 

 are longer, acutely rounded at apices, and usually separated from one 

 another at bases along anterior margin. 



Elytra at base slightly wider than pronotum near middle; surface 

 coarsely, densely, irregularly punctate, the punctures on disk about 

 as wide as intervals, rather densely clothed at sides and on apical 

 declivity with long, erect, yellowish hairs, intervals on basal half of 

 disk scabrous, without distinct rows of elevated, beadlike granules, but 

 with irregular shaped granules, each with a short yellowish hair aris- 

 ing from its side and curved over the puncture; apical declivity dis- 

 tinctly, coarsely, irregularly granulose. 



Abdomen beneath sparsely, coarsely, shallowly punctate, sparsely 

 clothed with long, recumbent, yellowish hairs. 



Length 3.5-6.5 mm., width 1-2.25 mm. 



Type locality. — Of substriatus, Provinces of Westrogothia and 

 Scania, Sweden ; types supposed to be in the Museum at Stockholm. 

 Of paciflcus, Mokel Hill, Calif. ; type in the Casey Collection in the 

 United States National Museum. 



Distribution. — This species is widely distributed throughout the 

 northern parts of the world. Lesne (1901) stated that this boreal 

 species is found throughout the Scandinavian countries, northern 

 Europe, and Russia, extending southward in the mountains to the 

 Carpathians and Alps of Transsylvania, across Siberia and into 

 Alaska, Canada, and the United States. Material has been examined 

 from Canada and nearly all the States in the northern half of the 

 United States. The localities given by Gorham (1883, 1886) are 

 probably from erroneously identified specimens. 



Hosts. — This species attacks Douglas-fir (Pseudotsuga taxifolia), 

 hemlock (Tsuga canadensis) , and all species of pines and firs (Pinus 

 spp. and Abies spp.) . In Europe Pinus sylvestris is especially suscep- 

 tible to its attacks. Lesne (1901) recorded it attacking pine bark used 

 for tanning. Burgess (1899) recorded this species as doing severe 

 injury to hemlock tan bark in Massachusetts, and Hopkins (1915) 

 reported the beetles in West Virginia as only attacking hemlock tan 

 bark after it is 2 or 3 years old. This species has been reported a 

 number of times as damaging furniture and lumber used in the con- 

 struction of buildings. 



Casey (1898) described Dinoderus paciflcus from seven specimens. 

 The type and one paratype are from Mokel Hill, Calif., two paratypes 

 from California, and one from Colorado without definite localities, 

 one from Placerville, Calif., and one from Coeur d'Alene, Idaho. 

 After examining the above type and large series of substriatus from 

 Europe and North America, the writer is unable to separate paciflcus 

 Casey from substriatus Paykull. 



