122 



THE SCOLYTID BEETLES. 



Revisional notes. This species has been an element of much con- 

 fusion in descriptions, revisions, and identifications, under the 

 names D. similis, D. obesus, D. rufipennis, etc. It is represented in 

 the type series in Le Conte's collection under D. similis, but the 

 specimen which bears the name label, and therefore the type of 

 D. similis, is a true D. obesus (Mann.). Le Conte (1868, p. 173) referred 

 D. similis to obesus on account of the intervals of the elytra being 

 " rough for their whole extent," which is the case in the type of 

 D. similis, and in all females of D. obesus. Later he evidently com- 



FIG. 75Dendroctonus pscudotsugse: Egg galleries and larval mines, a, Beginning or basal sections of egg! 

 galleries in bark; b, entrance; c, egg gallery; d, ventilating hole; e, egg nest;/, abnormal branch; g, lar- 

 val mines; h, egg gallery packed with borings; i, subsequent passage or inner gallery through borings. 

 (Original.) 



pared the type of D. similis with a single male specimen of D. olesusA 

 in. his collection, which, according to Mr. Henshaw, is from thej 

 Mannerheim collection, and finding that this differed from his D. 

 similis in the smooth elytral declivity he restored D. similis (Le Conte, | 

 1876, p. 385) and called attention to the roughened interspaces of tl 

 declivity as a distinctive character; all of which makes it quite cleai 

 that he considered the specimen bearing the name label as the type j 

 of his D. similis and that therefore this name must fall as a synonyi 

 of D. obesus Mann. Thus the other specimens of the type series ai 

 left to represent a distinct species as here described. In 1900 it wt 



