Platynin^ 115 



body, the third and fourth joints equal; prothorax large, scarcely a 

 third wider than long, the parallel sides very evenly and rather 

 strongly arcuate, the angles very broadly rounded and obliterated; 

 base much wider than the relatively narrow and deeply sinuate apex, 

 gradually arcuate laterally, finely margined; side margins widely 

 and strongly reflexed, a little more so basally; impressions obsolete, 

 the stria very fine; fovea; discal, short, linear and deeply impressed, 

 lying just within a feeble convexity of the surface, only very feebly, 

 transversely rugulose; elytra oblong, slightly dilated behind, some- 

 what less than one-half longer than wide, not quite a third wider 

 than the prothorax, gradually evenly rounded at apex, the sinus 

 scarcely more than straight; striae fine, nearly smooth; intervals 

 almost Hat, the anterior puncture at the third stria, the two posterior 

 somewhat axial, although variable in position. Length (9) 8.0 

 mm.; width 3.28 mm. Lake Superior (Marquette). [PL atratus || 



Lee] mutatum G. & H. 



Elytra much more conspicuously wider than the prothorax 8 



8 — Elytra black, sometimes very faintly bronzed in harrisi 9 



Elytra somewhat piceous in color 11 



9 — Form oblong, larger in size. Body and legs deep black, polished in 

 both sexes, the elytra sometimes with very feeble bronzy lustre; 

 head rather large, with .large and somewhat prominent eyes, almost 

 two-thirds as wide as the prothorax, evidently elongate; antennae 

 long, slender, over half as long as the body (cf ), shorter (9 ), the 

 third joint shorter than the fourth; prothorax nearly two-fifths 

 wider than long, the evenly rounded and parallel sides distinctly 

 reflexed, a little more so basally, the angles very obtuse, broadly 

 rounded at tip; base distinctly wider than the sinuate apex, arcuate 

 laterally, the marginal bead obsolete medially; impressions sub- 

 obsolete, the stria very fine, not entire; fovese elongate-suboval, 

 very shallow, not quite smooth, the surface thence to the sides with a 

 small and very feeble convexity; elytra rather elongate, fully three- 

 fifths longer than wide, not quite one-half wider than the prothorax, 

 parallel, gradually rounded at apex, the sinus long, oblique, scarcely 

 more than straight; striae fine, almost imperceptibly punctulate, 

 scarcely impressed, the fifth — often at base and near apical fifth — 

 more indented; intervals feebly convex to flat, the anterior punc- 

 ture at the third stria, the other two generally near the second; 

 anterior male tarsi feebly dilated, sometimes pallescent. Length 

 (cf 9) 8.3-9.7 mm.; width 3.25-3.9 mm. Rhode Island to Lake 

 Superior. Black Hills and Saskatchewan, — LeConte. Abundant. 



[PL corvus Lee] harrisi Lee. 



Form oblong, much smaller in size and of narrower outline. Deep 

 polished black throughout, only moderately convex, the legs partially 

 picescent; head triangular and only slightly elongate, three-fifths as 

 wide as the prothorax, the eyes well developed but only moderately 

 prominent; antennae slender, black throughout, half as long as the 

 body; prothorax a third wider than long, widest at the middle, 

 with evenly and moderately arcuate, widely but not strongly reflexed 

 sides, becoming more strongly reflexed at the basal angles, which 



