Coleoptera 5 e 



Family IPIDAE (Scolytidse). 



Four species of this family were taken by Mr. Johansen in white spruce 

 on the Coppermine river in latitude 67° 30', and another in hemlock bark at 

 Latouche, Alaska. 



Genus Dendroctonus Erich. 

 Erickson, Weig., Archiv., 1 : 52, 1836. 



Dendroctonus johanseni, n. sp. 



Plate II, figure 6. 



Length 7 mm.; width 3 mm.; colour yellowish brown (immature); rather 

 abundantly clothed with reddish hairs of moderate length; closely allied to 

 punctatus Lee. 



The head has the front convex, broadly transversely impressed towards 

 the epistoma, coarsely, closely irregularly rugosely punctured and hairy; the 

 dorsal process of the epistoma with the sides oblique, not attaining the epistomal 

 margin, followed behind by a short, acute, median, longitudinal carina; the 

 vertex with the longitudinal line impressed; the eyes narrow, wider above; 

 the antennal club slightly longer than wide, the first segment nearly as long 

 as the rest united. 



The pronotum wider than long, slightly narrower than the elytra, the sides 

 nearly straight on the caudal two-thirds narrowed from the hind angles con- 

 stricted in front on the sides and dorsum bisinuate on the front margin with 

 wide, oblique, impressions behind the middle; moderately closely and deeply 

 punctured, the punctures irregular, of medium and small sizes, closer on the 

 sides; with a narrow, acute, median carina from the base nearly to the front 

 margin clothed with subrecumbent, short, reddish hairs. 



The elytra one and one-half times as long as wide; the stria? impressed 

 moderately throughout more strongly towards the suture and on the sin - 

 the strial punctures rather coarse, not deep, rather close, smaller at the bas 

 very little reduced in size on the declivity; the interspaces moderately convex, 

 hardly wider or sometimes narrower than the stria? confusedly roughened with 

 acute granules, moderate in size, becoming more numerous, larger, transverse 

 asperities at the base, and sparse and acute behind; the larger granules uniseriate 

 towards the declivity, reduced in size upon the declivital face with irregular 

 small, feebly granulate punctures on the declivital interspaces; the granules 

 smaller and the punctures more numerous on the lateral interspaces than on 

 the disc; the suture wider with the granules confused throughout; the punctures 

 of the declivital stria? distinct, almost as large as upon the disc; rather sparsely 

 clothed throughout with long, erect, reddish hairs longer upon the declivity. 

 The ventral surface finely granulate punctate. The proepisternal area dis- 

 tinctly moderately punctured, not strongly granulate. 



The male declivity is brightly polished with the strial punctures somewhat 

 smaller. 



Type No. 152, Sandstone rapids, Coppermine river, Northwest Territories, 

 F. Johansen, collector; Feb. 15, 1915, 2510. Host, Picea canadensis. 



This species together with micans, of Europe, and punctutas Lee, of the 

 Eastern States, forms a sharply isolated group, distinguished by the coarse 

 strial punctures of the elytral declivity. It is closely allied to punctatus Lee. 

 but appears to be distinct. The pronotal carina is barely indicated in punctatus, 

 the elytral striae are only feebly impressed on the disc, the strial punctures 

 smaller and the elytral interspaces wider than the striae and less coarsely granu- 



65861—2 



