70 MEMOIRS ON THE COLEOPTERA 



than the thoracic width; prothorax not quite twice as wide as long, the 

 sides almost evenly rounded, though perhaps a little more converging 

 basally than apically, three-fourths as wide as the elytra; surface moder- 

 ately convex, much less declivous laterally than in the two preceding, 

 finely but strongly, rather closely and distinctly punctate and confusedly 

 creased, becoming densely punctate and rugose laterally, feebly reflexed 

 anteriorly, not at all so medially and flat, though sloping upward just 

 visibly from the impression to the sides, at base, the bead distinct an- 

 teriorly, wholly disappearing at the middle and thence to the base forming 

 an increasingly wide, flat and punctureless border; basal angles of unusual 

 form, being but slightly obtuse though rather sharply angular, the inner 

 side of the angle oblique and straight to the truncate median part of 

 the base, the outer side forming a continuation of the lateral arcuation; 

 elytra scarcely more than a fourth longer than wide, with only moderately 

 rounded humeri; surface convex, rather dull, smooth, having very fine 

 but continuous scratchlike striae, which are slightly wavy but not punc- 

 tate, the intervals each with a regular series of fine, not close-set punctures 

 and some confused suboblique detached scratches; margins moderately 

 reflexed, having a closer series of coarser graniferous punctures though 

 scarcely at all rugose; legs rather long and slender; anterior tarsi (cf ) 

 moderately dilated, the second joint scarcely at all wider than long. 

 Length (cJ 1 ) 13.2 mm.; width 6.7 mm. California (Sequoia National 

 Park, 4600', Tulare Co.). 



The sijigle type was sent to me by Mr. Hopping under the name 

 dietzi; but the small size, conformation of the basal thoracic angles 

 and peculiar elytral sculpture preclude any such association. 



The luxatus group comprises numerous species, in general very 

 well differentiated among themselves and having great diversity 

 of form and sculpture; latipennis of Horn and the true luxatus 

 are still wanting in my collection, and, in the following table, are 

 interpolated as accurately as possible from the published descrip- 

 tions. The erect setae at the sides of the prothorax, conspicuous in 

 some species, do not seem to have been noted heretofore. 



Side margins of the elytra perfectly even 2 



Side margins serrate basally 10 



2 Elytra strongly sculptured 3 



Elytra feebly sculptured, except very near the sides 8 



3 Prothorax not at all reflexed at the sides, the marginal bead equal 

 from apex to base, the basal angles very broadly rounded and only 

 very slightly produced posteriorly. Body small, rather narrow, 

 deep black; head with strong and moderately close punctures, 

 becoming fine and sparse medially on the vertex and front, the 

 lateral rugse feeble; mandibles with very feeble sparse rugae; antennae 

 as long as the head and prothorax, glabrous, the outer joints with a 

 large outer and inner sharply limited area of dense punctulation 



