26 



not widened behind, shining, the sides feebly retuse, with a row of minute 

 granules on the suture and along the region of the third interspace; the whole 

 declivity smooth and brightly shining, with the punctures extremely minute, 

 hardly visible except towards the sides. The disc and the declivity are almost 

 glabrous, with only minute, very sparse pubescence; the pubescence about the 

 lateral margins very short but distinct. The last sternite is rather deeply 

 broadly emarginate. 



The male has the front flattened as above, but coarsely, fairly closely 

 punctured with a well-developed median carina, and the pubescence almost 

 invisible; the last ventral is emarginate as in the female. 



Quebec province, TuUochgoram; Picea canadensis. 



Pityophthorus rhois, n. sp. 



Descri'ption of adult. — Length, l-6mm.; the width three-eighths of the 

 length; with the declivity very steep and retuse on the sides. 



The head has the front coarsely punctured above, very distinctly flattened 

 on the cephalic half, this area distinctly margined by an acute semicircular line, 

 coarsely punctured, with slender hairs of moderate length, with an acute median 

 denticle on the front margin; the vertex and gense nearly impunctate, finely 

 transversely aciculate; the eyes rather deeply emarginate, coarsely granulate; 

 the antennal club very large, the first two sutures straight, the third arcuate 

 and near the apical margin. 



The pronotum is as long as wide with the hind margin very broadly rounded, 

 subtruncate, and finely margined; the sides faintly arcuate, subparallel on the 

 caudal half, feebly constricted in front of the middle and rather broadly rounded 

 on the front margin, which is very finely serrate; the cephalic half concentrically 

 asperate, in fairly distinct rows, the first distant from the serrate front margin; 

 the caudal half rather coarsely and closely punctured on the disc, more sparsely 

 on the sides, with a small irregular lateral impunctate area and a narrow, slightly 

 elevated, smooth median line; the venter of the prothorax coarsely punctured in 

 front, smooth and shining behind. 



The elytra are as wide as the pronotum, three-fifths as wide as long; with 

 the base truncate; the sides nearly parallel to beyond the middle then moderately 

 narrowed and finally subtruncate on the caudal margin, as viewed from above; 

 the striae moderately impressed, the strial punctures moderately coarse, deep 

 and closely placed; the interspaces narrow, impunctate on the disc, punctured 

 on and near the declivity and on the sides, and the sutural interspaces sparsely 

 punctured. The declivity is very steep with the suture raised, sparsely uniseriately 

 granulate and hairy, the first and second strise together with the intervening 

 second interspace distinctly impressed, smooth and shining; the second strise 

 strongly punctured; the lateral portions of the declivity strongly convex, the 

 intervals granulate-punctate and setose. The interstrial punctures bear rather 

 long erect hairs, which are therefore sparse and not present on the disc 

 except along the suture. The last ventral segment is very deeply emarginate. 



The type was taken by the writer at Ithaca, N.Y., in dead sumach limbs. 

 It is a common species throughout the eastern part of the United States and 

 Canada, usually confused in collections with Leconte's consimilis. 



There is a series in our collection from Biscayne, Key West, and Haw 

 Creek, Florida, which is left as a smaller race of rhois. It is slightly but dis- 

 tinctly smaller than the northern material, but of the same proportions and 

 sculpture. 



