AMERICAN COLEOPTERA. 99 



at middle; disc feebly convex, sides very narrowly margined, margin slightly 

 reflexed, surface smooth, anteriorly slightly rugose, at sides more rugose and 

 punctured, base deeply transversely impressed, and a deep impression within 

 the hind angles, coarsely but sparsely punctured and rugose. Elytra elongate- 

 oval, humeri totally obliterated, surface rather deeply striate, strire distantly 

 punctured, interspaces feebly convex. Body beneath sAiooth, black, shining. 

 Legs black, long, slender. Lengsh .55 % — .64 9 inch ; 14 — 16 mm. 



Head short and robust, eyes less prominent than in any other of 

 our species. Sides of thorax moderately rounded in front, strongly 

 sinuate behind, hind angles strictly rectangular. The lateral margin 

 of thorax very narrow and feebly reflexed. Anterior transverse im- 

 pression faint, longitudinal, distinct but not strong. Elytra elongate- 

 oval, sides rounded, slightly broader behind the middle in the male. 

 The strife are nearly as deep as in pallipes, distantly punctured, in- 

 terstices feebly convex and without dorsal punctures. 



The Male, has the anterior tarsi feebly dilated ; last abdominal seg- 

 ment with a broad shallow excavation divided longitudinally by a 

 ridge. 



The Female, has a narrow coriaceous band between the third and 

 fourth abdominal segments at middle. 



Resembles by its elongate form gregaria, Esch., but easily known 

 by the oval elytra, the thorax narrower behind, and less marginel on 

 the sides. 



The mentum, at the base of the emargination, is not armed with a 

 broadly emarginate tooth, but distinctly bisinuate, the ligula is feebly 

 prominent. As the form of the mentum tooth and the degrea of its 

 emargination vary, I have not thought it advisable to separate it, from 

 Xehria as a distinct genus. 



Two specimens of this species were collected by the Geological 

 Survey party under Prof. Brewer, in the high Sierra Nevada 3Ioun- 

 tains east of Visalia, California. 



N. diversa, Lee. List. Col. IST. A. p. 2; llvidalliQC. Proc. Acad. 1859, p. 

 84. 



This species is easily known by its pale yellowish testaceous color, 

 and oval elytra, with the humeri rounded. The species is not apter- 

 ous, the wings being very distinct but rather poorly developed. The 

 elytra have more distinct stria), moderately deep but impunctured. 

 The number of large punctures in the stride is rather variable, and are 

 in the third four, fifth two, and sixth three, usually. The eighth 

 striae has however very many large punctures causing, the edge of the 

 next outer interval to appear coarsely serrate. The sides of the 

 thorax are feeblv sinuate at base but the anirles are not rectangular. 



