6 e Canadian Arctic Expedition, 1918-18 



late than in Arctic species. D. pnnctatus Lee. has been recorded from West 

 Virginia, New York, and Pennsylvania, but has apparently never been taken 

 in Eastern Canada. 



Described from about sixty immature adults, taken by Mr. Johansen, 

 dead, in the dried bark at the base of a large dead tree, in February. The 

 beetles had evidently been dead sometime and were brittle, so that many are 

 in poor condition. Mr. Johansen considers these beetles the primary cause 

 of the death of the tree. It appears that some agency, probably abnormal 

 weather conditions, had killed the broods that he found before they emerged 

 from the bark. 



Genus Carphoborus Eichh. 

 Eichhoff, Berl. Ent. Zeit., 8: 27, 1864. 



Carphoborus andersoni, n. sp. 



Plate II, figure 1. 



Length, 2-5 mm.; width, 1 mm.; colour, pale reddish (immature). 



Description of the Female : The head has the front flattened and densely 

 clothed with a brush of rather short yellow hairs; the antennae slender, the club 

 longer than wide. 



The pronotum is slightly wider than long, with the sides arcuately narrowed 

 from base to apex, only feebly constricted in front; the front broadly rounded; 

 the disc closely and deeply but not coarsely punctured, the median line very 

 faint; the pubescence very small, scale-like, not concealing the surface. 



The elytra are elongate, the sides subparallel, broadly rounded behind; 

 the bases very strongly elevated and rugose as usual; the striae distinctly im- 

 pressed, as wide as the interspaces, the strial punctures coarse and closely 

 placed; the interspaces convex, feebly granulate, clothed with abundant rather 

 slender pale scales which do not entirely hide the surface; the declivity with 

 the 1st interspace but little more elevated than the 2nd and only feebly granulate, 

 the 2nd interspace convex, nearly smooth, narrower behind; the 3rd interspace 

 rather strongly elevated and armed with 5 or 6 rather coarse acute serrations; 

 5th and 7th interspaces united in a rather broad curve slightly elevated behind 

 and together bearing 3 or 4 acute serrations. This species will go in my key, 

 Dom. Ent. Br. Bull. 14, pt. 2, p. 57, under AA, BB, but is widely separated 

 from bicristatus and bifurcus by the large size, coarse declivital serrations, less 

 elevated declivital alternate interspaces, and characters of the front. 



Type No. 153, Sandstone rapids, Coppermine river, Northwest Territories, 

 F. Johansen, collector; Feb. 15, 1915; 1 paratype (a few fragments); lot 2908. 

 Host, Picea canadensis. 



One set of tunnels was found in a white spruce limb about one inch in 

 diameter. The nuptial chamber is 6 mm. in diameter with the entrance tunnel 

 indicated and three egg-tunnels; one of these is possibly complete, 6 cm. long, 

 1 mm. wide, with 28 egg-niches and larval mines developed from 16 of these. 

 The second egg-tunnel is 1 cm. long, with 3 egg-niches cut, and the third tunnel 

 is only started. The egg-niches are small and alternately arranged. The 

 mines are probably not completed; the longest is slightly more than 2 cm 

 in length. Some are modeiately elongate and some widen very rapidly. All 

 are filled with white boring dust mixed with red excrement. The species had 

 overwintered as immature larvae and two young immature adults. The stick 

 was collected in February, 1915. 



