104 CHARLES W. LENG. 



less convergent and feebly arcuate in outline; elytra widest before tbe middle 

 and tapering tlienca to apex ; lateral margin of tborax fine and but slightly re- 

 flexed, attaining tbe basal margin; labrum nearly truncate; bead wrinkled all 

 over; form slender; antennse slender. 



O. eloiigatus. — Same as preceding, except labrum deeply bisinuate, the 

 median lobe more advanced. 



O. sequoiariiin. — Elytra not foveate; thorax smoother and less deeply 

 wrinkled, but without any smooth space at centre; 14-18 mm. ; sides of thorax 

 arcuate in outline and slightly convergent towards base; thorax broader and 

 stouter than usual ; elytra widest at middle, broader, stouter, shorter, more con- 

 vex than in other species ; lateral margin of thorax fine and but slightly reflexed, 

 attaining the base ; labrum deeply bisinuate, the median lobe more advanced ; 

 bead sometimes smooth or simply punctate for a small space at the middle of the 

 front; antennae stout. 



O. Hornii.— Same as preceding but the thorax is still broader and nearly 

 quadrate. 



O. Audouiilii. — Elytra not foveate; 13-18 mm. ; thorax much smoother, 

 with a central space free from wrinkles ; color, black ; elytra confusedly punctate ; 

 antennae slender; lateral margin of thorax fine and but slightly reflexed, obliter- 

 ated behind ; sides of thorax nearly straight, convergent towards base ; head some- 

 times punctate in the middle of the front; labrum transverse; elytra elliptical, 

 widest at middle. 



O. aiubigiius differs by the stouter antennae, and the smoother more regu- 

 larly and distinctly punctate elytra. 



O. submetallicus differs by the color and the elytra being broader pos- 

 teriorly. 



O. Isevis. — Elytra not foveate; 14-18 mm. ; thorax entirely smooth without 

 any wrinkles ; elytra smooth or punctate ; antennae stout ; lateral margin of thorax 

 fine and but slightly reflexed, attaining basal margin ; elytra regularly oval in 

 form ; body rather stout; sides of thorax feebly arcuate in outline, convergent to 

 base; head entirely smooth ; labrum bisinuate. 



I am not entirely satisfied that the forms with distinctly punctate 

 elytra, which generally come from an elevation of 3000 to 6U00 feet, 

 should be united with the typical hevis, living at 9000 feet, and 

 having impuuctate elytra ; but, as Dr. Van Dyke believes both forms 

 occur together, and are simply forms, not races, I leave this species 

 for further investigation in California. 



O. intermedins n. sp. 



Length, 17 mm. = .68 inch. 



Moderately stout, deep black and shining. Head moderate in size, wrinkled 

 all over except the middle of the front which is smooth and sparsely punctate, 

 frontal impression feebly impressed ; labrum bisinuate, the median lobe moder- 



