MR. HALDEMAN'S DESCRIPTIONS OF COLEOPTERA. 107 



scutel concave, levigate, and faintly rufous : elytra striate, striae indistinctly punctate ; 

 intervals flat, convex posteriorly, their internal margins indistinctly lineate-punctate 

 or crenulate ; suture bounded with a longitudinal row of minute punctures on each 

 side, a similar series (sometimes obsolete) along the exterior margin of the intervals: 

 feet dark rufous, other inferior parts with a tinge of rufous ; sternal plate deeply 

 impressed along the median line, and with the abdomen, densely punctured. 



Of three specimens examined, one may be termed indistinctly punctate striate, the 

 punctures or crenulations of the interval extending into the strife. Its facies is that 

 of Oxyomus gracilis Mels., whilst the sub-dentate clypeus allies it to the genus 

 Ammoecius Mulsant. I have not yet met with the more recent divisions of this and 

 the allied genera by Erichson. 



RHYSSEMUS Mulsant. 



R. scABER Hald. Opake, nigro-fuscous, scabrous, front and four transverse 

 elevated lines on the pronotum, composed of larger elevations ; margin of the head, 

 antennae palpi and feet rufous; elytra porcate. Long. 1|, lat. | lin. Hab. Middle 

 States. Head semicircular, obtusely auriculate, margin rufous and reflexed ; an 

 obtuse frontal impression terminating in the emargination of the clypeus ; disk 

 elevated towards the centre, verrucose, the larger tubercles being central and the 

 smaller ones posterior ; pronotum verrucose, transversely 4-sulcate, the intervals with 

 larger tubercles ; extreme anterior margin flavous, transversely rectilinear, angles 

 sub-prominent, obtuse ; lateral margin convex, not margined ; posterior angles and 

 base forming a semicircle ; base near the scutel, and lateral margins, ciliate with 

 short thick flavous hairs : elytra rather narrower at base than the prothorax, sides 

 convex, and widening posteriorly to two-thirds of their length, when they contract, 

 the apex being obtusely rounded ; convex above, porcate, interstices gemmate 

 catenulate ; there are ten principal-elevated lines excluding the sutural one, and six 

 of these are double, a second catenulate row rising from the sulci : abdomen beneath 

 with a transverse row of longitudinal punctures at the base of the segments, and 

 another transverse row of irregular ones upon the middle of each segment. 



PSAMMODIUS Gyllenhal 



P. ^GiALioiDES Kald. Polished castaneous, head and pronotum blackish, antennae 

 fulvous. 1§ 1. long. Hab. Middle States. 



Head auriculate, acutely emarginate, margins reflexed, and faintly rufous ; surface 

 densely tuberculate, two elevated lines and two sulci extend diagonally towards the 

 margin from the vertex : pronotum with four transverse sulci filled with approximate 

 dilated punctures; the two posterior ridges are interrupted by the short impressed 

 punctate dorsal line, which extends from the base to the third transverse ridge ; 



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