NORTH AMERICAN COLEOPTERA. 23 



deep aud arcuate. Elytra a little wider tban the thorax, strise distinctly im- 

 pressed and rather broad, punctures coarse, deep and closely placed, but finer 

 near the apex, intervals narrower than the strife aud slightly transversely 

 wrinkled. Leugth .08 inch.; 2 mm. PI. ii, fig. 8. 



This S{)ecies has the facies of discretus, but is readily known among 

 those in which the thorax is deeply emarginate near the hind angles, 

 by the entire absence of discal foveas. 



Occurs at Eagle Harbor, Lake Superior (LeConte), and in my 

 cabinet from California. 



O. iiiterrtiptus Lee. — Form moderately elongate, pale piceous, surface 

 distinctly aeneous. Thorax nearly twice as wide as long, the apical margin 

 broadly, but not deeply emarginate, a slight emargiuation within the angles; 

 sides moderately deeply, but not abruptly sinuate behind the middle, the trans- 

 parent border beginning very near the front angles and continuing the gradual 

 curve of the sides ; disc regularly convex, the punctures moderately coarse, but 

 not close, median line moderately deep and long, discal foveje moderate in size, 

 deep and well separated, lateral impression deep and arcuate, a slight depression 

 in the hind angles. Elytra oblong oval, not wider at base than the thorax, striae 

 slightly imj.ressed at the sides, punctures moderate in size, subquadrate, closely 

 placed, intervals as wide as in the striae, slightly convex and nearly smooth, or 

 slightly transversely wrinkled. Legs pale. Length .08 inch.; 2 mm. PI. ii, 

 fig. 9. 



This species is intermediate in many respects between the series 

 which precedes and those following, the thorax being rather more 

 deeply sinuate behind the middle than in the next four, but much 

 less so than in the preceding. The thoracic sculpture is not very 

 unlike that of attrltus, but deeper. 



Occurs from the Peninsula of California northward to Vancouver, 

 eastward to Wyoming, also in Arizona. 



O. atlritus Lee. — Moderately elongate, piceo-testaceous, surface distinctly 

 aeneous, legs pale. Thorax less than twice as wide as long, apex scarcely emai- 

 ginate, a slight sinuation within each apical angle, sides slightly arcuate in front, 

 a feeble sinuation beginning slightly in front of middle, the transparent border 

 narrow, continuing the curve of the anterior third; disc feebly convex, the 

 prolongation moderate, not close, median line distinctly impressed, discal foveae 

 shallow or nearly absent, lateral impression deeper and more coarsely punctured. 

 Elytra slightly wider at base than the thorax, striae scarcely impressed, punc- 

 tures moderately coarse, closely placed and subquadrate, the intervals slightly 

 narrower than the striae, feebly convex and transversely wrinkled. Length .06 

 inch. ; 1.5 mm. Pi. ii, fig. 10. 



Under this name are included two species described by Dr. Le- 

 Conte from uniques, attritm and simplex, the only perceptible differ- 

 ence being in the degree of thoracic sculpture, the former having 

 the fovete faintly marked, while in the latter they are nearly obliter- 



