THE GENUS DENDEOCTONUS. 121 



(ibid). Dietz, 1890, p. 31 (in part), Michigan and Lake Superior, fig. 4, antenna 

 and epistoma. Harrington, 1891, p. 27, habits and host. Hopkins, 1898a, p. 69, 

 distinct from rufipennis (piceaperda). Hopkins, 1898b, in larch in W. Va. 

 Hopkins, 1899a, p. 392, etc., fig. Iviii, adult, revisional notes, etc., host, distribu- 

 tion. Hopkins, 1899c, p. 343, good species, habit, host, etc. Felt, 1906, p. 752 

 (in part), bibliography. 



Dendroctonus similis (not of Le Conte, 1860) Le Conte, 1876, p. 385 (in part), re\n.- 

 sion, synonymy, bibliography, localities. Dietz, 1890, p. 31, Canada. 



Dendroctonus rufipennis (not of Kirby) Le Conte, 1876, p. 385 (in part) (in collec- 

 tion 1900-1907, under rufipennis). 



Dendroctonus sp. Harrington, 1884, p. 218. Packard, 1890, p. 903. 



13. Dendroctonus pseudotsugae Hopkins. 



(PL V, fig. 13.) 



Adult. — Type of species: Length 5.75 mm.; reddish brown, with 

 the prothorax darker. Head with front convex, with faint median 

 and posterior impression; elytral decHvity with strife deeply im- 

 pressed; epistomal process narrow, shght, with sides nearly parallel, 

 the apex scarcely projecting beyond the anterior margin. Pronotum 

 with punctures fine, and moderately regular in size; elytral rugosities 

 moderately coarse, finer on lateral area, coarse and more acute on 

 dorsal area and vertex; striae of dorsal area distinctly impressed, not 

 impressed on lateral area; punctures coarse and distinct. Pronotum 

 with moderately long hairs on the lateral area. Secondary sexual 

 characters: Elytral declivity convex, with interspaces rugose and 

 the striae distinctly impressed and punctured. 



Type labeled "Type No. 7450 U.S.N.M.," name label, ''Hopk. 

 1/22/08, Pseudotsuga taxifolia, Hopkins, collector. Grants Pass, Or,, 

 ? , Hopk. U. S. 39." 



Male type: Length 5.75 mm.; elytral declivity with interspaces 

 strongly convex and smooth, shining, sparsely punctured; striae 

 deeply impressed, punctures obscure, otherwise as in female, 



Male type labeled " <? type," name label, "Hopk. 1/22/08," other- 

 wise same as female. 



Variations. — The length varies from 4 to 7 mm., with the average 

 about 6 mm. The color ranges from light reddish to nearl}^ black. 

 The usual variation in sculpture, vestiture, etc., prevails. The 

 greatest variation is in the size and color, and in the size of the 

 punctures of the pronotum. The epistomal process varies consid- 

 erably, so that in some specimens it extends beyond the epistomal 

 margin, while in others it does not. 



Distinctive characters. — This species and the one preceding are 

 at once distinguished from all of the other species of the genus by the 

 characters of the epistoma and from each other by the sculpture of 

 the pronotum and the difference in average size of representative 

 individuals. D. pseudotsugse is distinguished especially by the 

 shining and finely punctured pronotum. 



