436 REVISION OF THE ELATERIMl 



Melanactes of the present essay) must receive a distinct name, as the definitions both of 

 Germar and Latreille absolutely exclude it, while the second division must be united with 

 the present genus. 



Our species may be grouped as follows: 



A. Tarsi subtus sequaliter pubescentes. 



1. Antenna subserratce, articulo 3 i0 cylindrico, scquentibus triangularibus, sequalibus : 



frons subconvexa ; corpus dilatatum, pubescens, elytris prascipue testaceis - Sp. 1 — 11. 



2. Antennas subserratas, articulo 3 io cylindrico, 4 t0 sequentibus longiore ; 



». Corpus dilatatum supra prascipue glabrum, frons planiuscula - - Sp. 12 — IT. 



/3. Corpus valde dilatatum pubescens, frons valde concava - - - Sp. 18. 

 y. Corpus lineare, supra glabrum, antennis articulis 2 et 3 singulis 4 t0 vix 



minoribus ..------ Sp. 19 — --0. 



3. Antennas serratse, articulo 3'° cylindrico, sequentibus triangularibus, asqualibus, 



ll m0 sub-constricto ; corpus lineare, glabrum vel pubescens ... Sp. 21 — 24. 



4. Antennas serratse, articulo 3 io dilatato; 4 — 10 sequalibus, ll mo constricto: frons 



plana: corpus lineare parallelum ------ Sp. 25. 



5. Antennas serratse, articulo 3'° vario, 4 — 10 sequalibus, ll rao constricto; frons con- 



cava, corpus subparallclum ----- - - Sp. 2G — 31. 



6. Antennas serratse, articulo 3 io triangulari, prascipue 4'° sequali, 4 — 10 sequalibus, 



11"'° prascipue non constricto ; frons subconvexa vel plana : corpus non dilatatum. 

 * Elytra postice rotundatim attcnuata: 



<*. Thorax angulis posticis carinatis ----- Sp. 32 — 35. 



/?. Thorax angulis posticis non carinatis - Sp. 36 — 37. 



** Elytra postice oblique attenuata, fortius marginata - Sp. 38 — 41. 



7. Antennas compressse, vix serratse, articulo 3'° sequenti asquali, ll mo vix constricto: 



frons concava, corpus prascipue lineare - Sp. 42 — 45. 



B. Tarsi articulis 2 — 4 sublus ad apicem sericco-spongiosi ... Sp. 4G — 49. 



A.— 1. 



1. C. hamatus, crassiusculus, capite thoraceque atris dense subtilius punctatis, aureo-pilosis, hoc 

 postice canaliculato lateribus rotundatis, angulis posticis subdivergentibus, margineque testaceis, cly- 

 tris testaceis, macula laterali transversa margineque pone medium fuscis, striis profundis punctatis, 

 interstitiis punctatis, abdomine rufo, pectore nigro, pedibus antennisque testaceis. Long. -43. 



Slater hamatus Say, Trans. Am. Phil. Soc. 6, 170. 



New Jersey, Mr. Gucx, one specimen. A very peculiar and well marked species, 

 having the form of C. hieroglyphicus, but very distinct by its characters. The third joint 

 of the antennae is not perceptibly larger than the second; the front is more elevated than 

 usual, and almost angulated at tip, the lateral margins converging so as almost to meet; 

 the palpi are black. The dense golden yellow hair of the thorax conceals the punctures, 

 which are dense, but not coarse; the lateral margin, posterior angles, and indexed portion 

 are rufo-tcstaccous; the dorsal channel is distinct posteriorly. The striae of the elytra 

 are strongly impressed, the interstices convex and densely punctured. 



