AMERICAN COLEOPTERA. 129 



New species of COLEOPTERA from the Pacific District of the United States. 



BY GEO. H. HORN, M. D. 



OMUS Esch. 

 0. submelallicus, aeneous black, shining, elongate. Head rather coarsely 

 alutaeeous, very sparsely punctured between the eyes. Thorax trapezoidal 

 slightly broader than long, sides moderately rounded, narrower behind, margin 

 not acute; anterior margin truncate, posterior sinuate, angles obtuse, surface 

 coarsely alutaeeous. Elytra elongate oval, broader behind the middle, margin 

 very acute and slightly reflexed toward the humeri, surface coarsely but not 

 densely punctured with a few large punctures irregularly placed along the mid- 

 dle of each elytron. Tibiae and epiplourre brownish-ferruginous. Length .58, '^ . 



California. A single specimen in the Cabinet of Mr. H. Ulke. 



A very singular species, differing from all our others by its more 

 elongate and cylindrical form as well as by its color. The elytra are 

 not regularly oval as in our other species. The sides in front of the 

 widest portion being nearly straight and gradually convergent. In form 

 of thorax it more nearly resembles Audouinn with the margin much 

 less acute. The elytral margin on the other hand is more acute than 

 in any other of our species and very distinctly reflexed towards the 

 humeri. This is now the fifth species of the genus and should be 

 placed between Audouinli and Ifsevis. 



PACHYTELES Perty. 

 P. testaceus, dark testaceous, both above and beneath. Head eloagate-oval, 

 surface very finely alutaeeous and with a few large punctures at the sides in 

 front of the eyes and within the insertion of the antennae, middle of front 

 between labrura smoother. Labrura slightly emarginate. Eyes moderately 

 prominent. Thorax trapezoidal, broader than long, narrower posteriorly, trun- 

 cate before and behind, angles nearly rectangular, sides moderately rounded 

 anteriorly, sinuate and slightly reflexed ; surface moderately convex, nearly 

 smooth and with a longitudinal impressed line. Elytra slightly broader than 

 the thorax, parallel, slightly longer than twice their width, aj^ex broadly round- 

 ed, base feebly emarginate, surface faintly striato-punctate, punctures very 

 fine and obsolete on the sides and apex. Beneath smooth, scarcely punctured. 

 Length .1(5— .20 inch. 



Besides the characters above given it may be seen that the thorax is 

 slightly broader than the head and much more smooth than either head 

 or elytra. The margin is very distinct and broadest near the basal an- 

 gles and somewhat narrower at the middle of the side than at the an- 

 terior angles. The whole surface is very sparsely clothed with very 

 short erect pubescence arising from scarcely evident punctures. The 



TRANS. AMER. ENT. SOC. (17) AUGUST, 1868. 



