8 E Canadian Arctic Expedition, 1913-18 
This species is abundant throughout the spruce forests of Canada, from 
the Pacific Coast eastward to Newfoundland. It is rare in pine, and rather 
commonly found in larch. 
About forty specimens were received in the bark of a section from a dead 
white spruce trunk collected by Mr. Johansen at Camp creek, below Sandstone 
rapids, Coppermine river, Northwest Territories, February. 15, 1915. 
The tunnels of this species, associated with those of Pityophthorus, were 
numerous on the exposed wood surface of dead standing trees and beneath 
the patches of bark which remained, particulai'ly. on the upper portions of the 
trunk; numbers of dead adults were taken in the tunnels beneath these patches 
of bark. On the dead and dying parts of the living trees these Polygraphus 
and Pityophthorus tunnels were also found, but they were not so numerous 
here as on the old dead trees, and were not found at all in some of the dying 
branches and trunks examined. It was evident that cerambycid larvae had 
been more injurious than bark-beetles during the season previous to the exam- 
ination. 
Genus Pityophthorus Eichh. 
Eichhoff, Berl. Ent. Zeit., 8; 39, 45, 46, 1864. 
Pityophthorus nitidus Sw. 
Plate II, figures 3, 4, 5. 
Swaine, Dom. Ent. Br., Dept. Agric. Bull. 14, pt. 1, p. 26, 1917. 
Description of the Female. — ^The length, 2.1 mm.; 2f times as long 
as the width; the elytral striae not impressed, the strial punctures small; the 
declivity sulcate-retuse, not acuminate. 
The head has the front flattened, the flat area bounded by a semi-circular 
line behind, very densely, minutely punctured and densely pubescent with 
short yellow haiis; the median carina nearly obsolete except the cephalic end which 
forms a rather prominent carinate tooth on the epistoma; the eyes rather finely 
granulate, deeply narrowly emarginate; the antennal club very wide, short 
oval almost subcircular, the sutures broadly arcuate the third most strongly, 
the first two segments each distinctly shorter than either of the last two; rather 
closely pubescent. 
The pronotuni is as long as wide; very broadly rounded behind, strongly 
arcuate on the sides behind; moderately constricted before the middle, broadly 
rounded on the front margin which is finely serrate, the asperities slightly 
stronger at the middle; the summit slightly in front of the middle with a wide 
transverse impression across the disc immediately behind the summit; finely 
subconcentrically asperate in front, rather coarsely, very densely, subgranulately 
punctured behind, the punctures smaller towards the lateral margins; with a 
small impunctuate spot on the middle of the side, and a smooth median space. 
The ehjtra are slightly less than twice as long as the pronotum, 9:5, faintly 
narrower than the pronotum; truncate at the base; the sides subparallel for 
over two-thirds the length then narrowed and rather broadly rounded behind, 
very faintly sulcate-^-etuse as viewed from above; the upper part of the declivity 
distinctly sulcate-retuse; the sutural striae finely impressed; the remaining 
striae only very faintly indicated, except near the lateral margins the last two 
strongly impressed, especially behind; the strial punctures small, fairly close 
and deep, in only moderately regular rows; the interspaces not convex, spai'sely 
uniseriately punctured in the interspaces of the disc, more closely punctured 
about the base and lateral margins; the ninth interspace moderately convex 
behind. The declivity is broadly sulcate above, the sulcus wide, not deep, 
not widened behind, shining, the sides feebly retuse, with a row of minute 
