1854.] 81 



spot on each elytron on the first smooth interstice about the middle : the meso- 

 sternum is not prominent : the club of the antennae in all the specimens is as 

 long as the remaining portion. A nearly allied species from Wisconsin, given 

 me by Mr. Guex, may be thus described. 



A. marginella, ovata nigra virescens, nitida supra glabra, capite densius 

 rugoso, postice punctato, thorace lateribus subansjulato, punctato, elytris pallide 

 testaceis, striis punctatis, sutura, margine, lineola humerali, guttaque utrinque 

 dorsali ad medium nigris, pygidio confertim subtiliter rugoso, opaco, antennis 

 testaceis, (lamella % longiore). Long. -4 -45. 



Helichus ae qua lis, fuscus aequaliter pubescens, subtiliter punctatus, 

 thorace latitudine longiore, lateribus vix rotundatis, fere parallelis : elytris vix 

 obsolete striatis. Long. *18. 



One specimen, Frontera (Rio Grande), Mr. Clark. This species differs from 

 H. lithophilus, by the thorax being longer, and scarcely narrowed anteriorly, 

 and by the fine punctures of thorax and elytra being very distinct: the striae of the 

 latter can hardly be traced. Its characters approach most closely to H. Gilensis 

 Lee. (Pro. Acad. 6, 43), a species of a broader form, and with very distinct lines 

 of punctures upon the elytra. 



Cymatodera b al t e at a, testacea, parce pilosa, capite thoraceque dense punc- 

 tatis fusco-piceis, hoc latitudine fere duplo longiore, subcylindrico, postice sub- 

 angustato antice transversim impresso, lateribus subsinuatis, elytris punctis 

 quadratis magnis seriatis postice minoribus, interstitiis parce punctatis ; gutta 

 utrinque ad quadrantem, fascia lata pone medium, alteraque angustissima sub- 

 apicali nigro-piceis, antennis capite thoraceque vix longioribus fusco-testaceis. 

 Long. 41. 



One specimen, Laredo to Ringgold Barracks, Mr. Schott. The general form 

 and appearance is that of C undulata, but the thorax is not constricted poste- 

 riorly and is less sinuate on the sides, and the punctures of the elytra are much 

 larger. 



Cymatodera c a nc el 1 at a, fusco-picea, parce pubescens, capite thoraceque 

 dense punctulatis, hoc latitudine sesqui longiore, pone medium subito fere duplo 

 angustiore, ante medium transversim impresso, lateribus antice parallelis, postice 

 sinuatis, elytris punctis magnis quadratis seriatis postice vix minoribus, inter- 

 stitiis angustis parce punctulatis, antennis capite thoraceque paulo longioribus, 

 extrorsum paulo incrassatis, articulis turbinatis, ultimo longiore cylindrico. 

 Long. *38. 



One specimen found with the preceding. Remarkable for the strange form of 

 the antennas, and for the sudden narrowing of the thorax behind the middle : 

 there is however, no posterior transverse impression, except the constriction in 

 the sides : the middle of the base is slightly elevated and marked with an oblong 

 fovea. It is closely related to C. brunnea Mels., but is smaller, with the thorax 

 much more narrowed behind. 



Elaphidion t a e n i a t u m, fuseo-piceum, tenuiter fusco-pubescens, thorace 

 latitudine vix breviore, lateribus rotundato, dense punctato, callis dorsalibus 

 minus distinctis, punctoque laterali albo notato, elytris thorace paulo latioribus, 

 antice grossius punctatis macula parva basali, alteraque transversa irregulari ad 

 medium albo-pubescentibus, apice truncato, breviter bispinoso : antennis (?) 

 corpore brevioribus, articulis 3 6 apice breviter unispinosis. Long. -95. 



One specimen, Mr. Schott. In form resembles E. atomarium, but is not quite 

 so robust: the thorax is scabrous with large punctures, the dorsal callosities are, 

 as usual, three in number, one medial elongated, the others each side in front of 

 the middle. The head around and between the eyes is densely pubescent with 

 whitish hair : the elytra are moderately shining, the punctures are not very 

 dense and become very small towards the apex. The thighs are not armed. 



Elaphidion t e n u e, nigro-piceum, valde elongatum, lineare, aequaliter longius 

 cinereo pilosum, thorace subcylindrico, latitudine fere sesqui longiore, lateribus 

 parum rotundato, sat dense punctato, callo elongato dorsali notato, elytris punc- 



