REVISION OF THE GENUS PHLOEOSINUS—BLACKMAN 471 
Pronotum about 1.17 times as wide as long, widest in posterior 
third; sides feebly arcuate on posterior third, more strongly, arcu- 
ately narrowed on middle third, constricted just behind the broadly 
rounded anterior margin; surface black, shining, transversely im- 
pressed opposite anterior constriction; disk with very deep, rather 
close, moderate-sized punctures, slightly roughened (subgranulate) 
at sides; median line not elevated, more finely and closely punctured, 
indefinitely impressed at each side of middle on posterior third; 
lateral calli usually small; puvescence short and fine, distinctly 
longer just anterior to lateral calli. 
Elytra slightly wider than pronotum, about 1.41 times as long as 
wide; sides nearly straight and subparallel on anterior two-thirds, 
moderately broadly rounded behind; surface shining; striae about 
half as wide as interspaces, rather strongly impressed, strial punc- 
tures close, of moderate size, rather shallow, similar on sides, consid- 
erably smaller on declivity; interspaces convex, confusedly granulate- 
asperate near base, rugose-punctate with occasional rounded granules 
in middle disk, becoming uniseriately asperate on first and alternate 
interspaces on posterior disk, pubescence short, fine, and inconspicu- 
ous on disk. Declivity with first, third, and alternate interspaces 
rather strongly convex, first and third closely, finely punctured, each 
with a uniseriate row of moderately small serrations; fifth and sev- 
enth interspaces with two to four similar serrations; ninth inter- 
space joining third, distinctly, rather finely serrate; second inter- 
space nearly flat, only slightly narrower than third, finely and mod- 
erately closely punctured, without serrations or granules; elytral 
pubescence consisting of short, fine hairs, none of them scalelike. 
Anterior face of mesosternum somewhat sloping. 
Female.—Similar to male in size and proportions; frontal rec- 
tangle about 0.64 as long as wide, densely granulate-punctate, with a 
fine, elevated median carina on lower half; elytral declivity with ser- 
rations much smaller than in male, pubescence consisting of numerous 
short, flat, scalelike hairs. 
Type locality —Alturas, Calif. 
Additional localities —Prineville and Redmond, Oreg. 
Host.—Juniperus occidentalis Hooker. 
Type material—hHolotype, allotype, and 133 paratypes, U.S.N.M. 
No. 55415. 
Remarks.—The holotype, allotype, and 40 paratypes were reared 
from small branches of Juniperus occidentalis taken at Alturas, 
Calif., by F. P. Keen; 40 paratypes were reared from limbs of J. occt- 
dentalis taken at Prineville, Oreg., by W. J. Buckhorn; and 53 para- 
types from J. occidentalis at Redmond, Oreg., by W. J. Chamberlin. 
The species is named in honor of W. J. Chamberlin, Oregon State 
College, Corvallis, Oreg. 
