AMERICAN COLEOPTERA. 259 



or simple, in wliicli no erect bristles are present, but the tarsi are also 

 retractile into tibial groves; and 3rd those in which only the anterior 

 tarsi are retractile, and the tarsi lobed or not, including Cjjtilus^ Mo- 

 rj/chus and Pedilop]t,orus.~\ 



B. altematus Say. — Nearly allied to varius, but comparatively longer, or ac- 

 cording to its length narrower. Kirby observed the differences between this 

 insect and the European varu'S / Melsheimer also distinguished it as a sepa- 

 rate species; whether the true varius Fabr. is found in America is doubtful. 



Stenelmis vittipennis Zim. — Length li line. Similar to sinuatu.s, but some- 

 what broader, and less convex; above blackish-gray, antenna;, tarsi, abdomen, 

 and bead of prothorax, ferruginous; prothorax longer than wide, scarcely nar- 

 rowed in front, with parallel sides, long and pointed front angles and slightly 

 elevated dorsal costse; elytra punctate-striate, the inner intervals broader than 

 in sinuatus, 3rd tolerably flat in front, and only the 6th costiform. — S. Carolina. 



Stenelmis linearis Zim. — Length 1 line. Slender, head, prothorax and scu- 

 tcllum dark bronzed ; elytra shining black, with a broad yellow vitta, which 

 begins on the humeral angle, then runs inside of the elevated costa of the 6th 

 interval, nearly to the tip; under surface and thighs blackish-gray, with blu- 

 ish and silvery reflections; antennce, tibise and tarsi ferruginous, front and 

 prothorax with a shining black longitudinal groove; prothorax elongate, scarce- 

 ly narrowed in front, with very feeble longitudinal ridges; elytra deeply punc- 

 tate-striate, with the 6th interval feebly elevated ; middle tibite on the inner 

 side finely toothed at the middle. 



LiMNius. — These species exhibit an intermediate form between 

 Stenelmis and Elmis; from the former they differ by the pubescent 

 spot on the inner side of the tibiae, from the latter by the round scu- 

 tellum. In the structure of the elytra, they have the narrow inflexed 

 side margin in common with Sfene/mis, but differ in a less degree, 

 since the costiform elevation, which in Stenelmis is always the 6th in- 

 terval, here belongs to the 5th, (the space between the suture and the 

 1st dorsal being counted as the 1st interval.) 



L. 'pusil\.\iS.^Ste7iel)>iis pusillus Lee, Proc. Acad. Nat. Sc. Phila. vi. 44. 



Parnus. — [In this genus, as here defined, are included as divisions, 

 Potaminns (^Dri/oj)s Leach), Parijgrus and Pelonomus.'\ 



Psephenus trentonensis Zim. — Length 2^ lines. Nearly allied to Lecontei, 

 but darker in color, blackish-gray, only the base of the thighs, the tarsi and 

 the inflexed margin of the elytra ferruginous-yellow; prothorax almost semi- 

 circular, the sides and apex, without prominent front, forming a common 

 curve; base deeply bisinuate, with flat hind angles. — Trenton Falls, N. Y, 



