BARK BEETLES OF THE GENUS HYLASTES 17 
Frons moderately narrow between eyes, slightly narrower than in macer, 
piceous, with epistoma slightly lighter and reddish ; epistoma broadly, moderately 
deeply impressed, bisected by the distinctly elevated, rather sharp median car- 
ina, which becomes weaker above and ends in the arcuate transverse impres- 
sion; epistomal margin piceous, thickened and liplike; median lobe wide, short, 
with middle half impressed and distal end broadly, moderately shallowly emar- 
ginate; arcuate transverse impression rather weakly developed, deeper in 
median area; surface subopaque, densely, finely granulate-punctate; vestiture 
not quite so conspicuous as in macer, longer on epistoma. Eye rather finely 
granulate, about twice as long as wide, considerably wider above. Antenna 
with first segment of club about equal in length to others combined. 
Pronotum narrower than elytra, about 1.18 times as long as wide, widest 
slightly in front of middle; posterior outline weakly arcuate; posterior angles 
rounded; sides nearly straight and slightly diverging on posterior half, then 
gradually, arcuately narrowed, more strongly so than in macer, moderately 
rounded in front; surface feebly shining; punctures close and moderateiy 
coarse, finer than in macer, somewhat smaller, and much closer at sides, gran- 
ulate, very fine and dense in front; median line smooth, slightly elevated, end- 
ing in anterior third. 
Elytra distinctly wider than pronotum (53:45), slightly more than twice as 
long as wide; sides nearly straight and subparallel on more than the anterior 
two-thirds, rather narrowly rounded behind; surface feebly shining to sub- 
opaque; striae impressed, the first one more strongly, and all strongly impressed 
behind and on declivity, with moderately coarse, circular punctures separated 
by slightly less than their own diameters, finer on declivity and sides; inter- 
spaces distinctly wider than striae, nearly flat and finely rugose-punctate anter- 
iorly on disk, convex and with small granules on declivity; ninth interspace not 
strongly elevated: discal interspaces nearly devoid of hairs, declivity with a 
middle row of short, fine hairs in each interspace and with numerous short, 
narrow scales. 
Remarks.—The type specimen in the Leconte collection, from which 
the description was prepared, was taken in Colorado. In addition, 
the writer has studied several other specimens from Colorado and 
New Mexico, collected by. Hubbard and Schwarz, and by Wickham, 
and five specimens reared from Pinus ponderosa Laws. from Estes 
Park, Colo., at the Fort Collins laboratory of the Bureau of Entomol- 
ogy and Plant Quarantine. 
HYLASTES NITIDUS Swaine 
Hylastes nitidus Swaine, 1917-18, Canada Dept. Agr. Ent. Branch Bul. 14 (1): 
19 (2) 24S: 
Female.—Dark reddish brown to black, 4.0 mm. long, scarcely more than 
three times as long as wide; of the size and proportions of gracilis Lec., but 
with scales on declivital interspaces of female. 
Frons broad between eyes, frontal rectangle almost exactly as broad as 
long, piceous, with epistoma somewhat lighter; epistomal margin piceous; 
epistoma broadly, rather deeply impressed at each side, bisected by a rather 
low, blunt carina, lower and fainter above where it ends in an arcuate trans- 
verse impression; epistomal margin piceous, thickened, and liplike; median 
lobe rather wide, moderately short, deeply and widely impressed in middle 
half, with distal end rather shallowly emarginate; arcuate transverse im- 
pression rather shallow, little deeper in median area; surface moderately shining, 
finely, closely punctured above and in epistomal impression, minutely punc- 
tured just below arcuate transverse impression; vestiture very fine and short, 
appearing glabrous, longer and mere conspicuous on epistoma. Eye finely 
granulate, twice as long as wide, narrower above than usual; inner line not 
emarginate. Antenna with first joint of club distinctly longer than the others 
combined. 
Pronotum distinctly narrower than elytra, about 1.25 times as long as wide, 
weakly arcuate behind; posterior angles rounded, sides nearly straight and 
