42 [April, 



line deeply impressed, surface obsoletely transversely wrinkled, basal lines di- 

 lated, distinctly indented, angles obtusely rounded, lateral edge regularly ar- 

 quated. Elytra, striae not deeply impressed, irregularly punctured. Thighs and 

 coxae rufous ; tibiae and tarsi dark rufous. 



" This species seems to belong to the genus Pterostiehus of Bonelli, and it may 

 be distinguished from those which we have mentioned to be referable to that 

 genus by the color of its feet." 



3. P. angustatus, niger, nitidus, thorace latitudine fere longiore, obovato, 

 fortius marginato, angulis posticis obtusis rotundatis, basi transversim impresso, 

 utrinque longius sat profunde impresso, elytris thorace duplo latioribus, ellipticis 

 fortius marginatis, striis profundis, interstitiis convexis, 3io quadripunctato, an- 

 tennis setaceis, tibiis tarsisque piceis. Long. *5 '55. 



Dej. Sp. Gen. 3, 98. 



Catskill Mountains, New York; Habersham Co., Georgia. This species is 

 probably found in all mountainous portions of the United States east of the Mis- 

 sissippi. 



4. P. stygicus, niger, nitidus, thorace latitudine paulo breviore, postice 

 angustato, fortius marginato, angulis posticis obtusis rotundatis, basi transversim 

 impresso, utrinque latius profunde impresso, elytris thorace vix duplo latioribus, 

 basi subtruncatis striis profundis, interstitiis subconvexis, 3io tripunctato, an- 

 tennis filiformibus. Long. .43. 



One specimen, found at Sault Ste Marie. This species resembles in appearance 

 P. sinuatus, &c, below, but from the absence of wings, and from the form of the 

 thorax, I am induced to place it in the present division. The margin of the thorax 

 is not as wide as in the other species, but is a little dilated towards the posterior 

 angles ; the basal impressions are deep, and are destitute of punctures or lines. 

 The elytra are slightly convex, and their lateral margin is somewhat narrower 

 than in the preceding species. 



B a. 



Composed of winged species, of a piceous black color and slender form ; the 

 antennas are long and setaceous; the thorax is strongly margined, a little wider 

 than long, somewhat narrowed posteriorly, with the basal angles obtuse, neither 

 prominent nor rounded ; the posterior transverse impression is strong, and the 

 basal impressions moderately long and deep. The elytra are more than twice 

 as wide as the thorax, truncate at base, finely margined, sinuate towards the 

 extremity ; the humeral angles are rounded ; the striae are fine, and the third in- 

 terstice has three punctures, the first being placed in the 3d stria, the other two 

 in the 2d stria. 



5. P.tenuicollis, piceo-niger, thorace latitudine fere longiore, capite non 

 latiore, margine latiore piceo fortius reflexo, angulis posticis subrotundatis, elytris 

 striis tenuibus profundis, tripunctatis, antennis palpis pedibusque piceis. Long. 

 3S. 



Ajichomenus tenuicollis Lee. Ann. Lye 4, 222. 



One specimen, found at the Sault Ste Marie. Although very much resembling 

 the next species in all its characters, the thorax is comparatively so much nar- 

 rower, that I am obliged to consider it as distinct. The base of the thorax is 

 more obliquely truncate each side, by which the basal angles are rendered more 

 obtuse. By a clerical error the specific name is printed angusiicollis, in Agassiz' 

 Lake Superior. 



6. P. marginatus, niger, nitidus, thorace latitudine paulo breviore, lateri- 

 bus rotundatis, margine latiore piceo fortius reflexo, basi late rotundata, angulis 

 posticis obtusis subrotundatis, elytris striis profundis, tripunctatis, antennis 

 palpis tibiis tarsisque piceis. Long. -42. 



Lee Agassiz' Lake Superior, 205. 



Anehomenus marginatus Lee. Ann. Lye. 221. 



Middle and Western States ; not rare. A specimen from the north shore of 



