Ilistory and Habits of Pityogenes. 9 
suture slightly elevated ; the sutur al striae slightly impressed, 
the remaining striae hardly at all impressed except the last 
which is finely, deeply impressed; the strial punctures in 
fairly regular rows, deep, not close, and smaller than those 
of the pronotum ; the interspaces uniseriately punctured, the 
punctures as coarse as those of the striae but more sparsely 
placed, particularly on the basal half; bearing long erect 
hairs; the punctures of the discal inter spaces granulate, more 
strongly towards the declivity ; those of the suture granulate 
to the base on the disc but smooth on the deelivity - the 
declivity distinctly elevated, more strongly and widely 
towards the apex; the sutural striae rather deeply and 
widely impressed and shining, so that the declivity is mod- 
erately distinctly retuse; the interstrial punctures on the 
declivital prominence of each side sparse and granulate; the 
granules of the second interspace on the declivity represented 
by three conical, acute, widely separated small teeth; the 
last coarsest, the first two but little larger than the preceding 
granules; the pubescence sparse but long, stiff and erect. 
The male has the front convex, coarsely granulate and 
closely hairy, without.the median impression. ‘The male 
declivity is very distinct ; strongly retuse with the three teeth 
of the second interspace on the declivity very coarse, the 
first, at the top of the declivity, compressed, recurved, with 
the point directed caudad, the second and third regularly 
conical and very acute; with the second interspace smooth 
on the dise and the fourth and sixth smooth throughout; the 
granules on the outer part of the declivity coarser and the 
hairs longer than in the female. 
This is the most abundant bark-beetle in limbs of Pine 
throughout the eastern part of Canada and the United States. 
The type is in the collection of the Entomological Branch, 
Department of Agriculture, Ottawa. 
In 1868 Leconte described Xyleborus sparsus from one 
specimen taken at Point Kewenaw, Lake Superior. In 
1878 he transferred sparsus to the genus Pityophthorus, and 
several authors have since placed it in the genus Pityogenes. 
The species usually discussed in literature under the name 
