456 REVISION OF THE ELATERIDJE 



punctatis, hoc latitudine vix breviore, lateribus parallelis antice rotundatis, angulis posticis subdiver- 

 gentibus, elytris striis profundis punctatis, interstitiis planiusculis, rugose punctatis, antennis pedi- 

 busque rufis. Long - 3 — '35. 



Mater mancus Say, Journ. Acad. Nat. Sc. 3, 171 ; Trans. Am. Phil. Soc. 6, 168. 



? Mater obesus Say, Journ. Acad. Nat. Sc. 3, 168; Trans. Am. Phil. Soc. 6, 168. 



Mater (Agriotes) obesus J Harris, Ins. Massachusetts, Injurious to Vegetation, 2d ed. p. 49. 



Agriotes truncatus Melsheimer, Proc. Acad. Nat. Sc. 2, 217. 



Agriotes striatulus Melsheimer, Proc. Acad. Nat. Sc. 2, 217. 



Lake Superior and throughout the Atlantic portion of the United States. A specimen 

 was communicated to me by Dr. Harris as Elatcr obesus Say: the remarks under that spe- 

 cies in the Transactions of this Society are as follows: "The clypeus is not prominent and 

 the thoracic spines are not carinated; the elytra in one specimen are acuminated at the 

 tip: the nails are very robust on the basal half, which terminates at the middle in a pro- 

 minent tooth, separated by a deep fissure." Now in the present species, as in all others 

 arranged under this genus, the spines of the thorax are strongly carinated, and the ungues 

 are not toothed. For these reasons I cannot adopt Dr. Harris' view regarding this spe- 

 cies, which appears to me to agree more nearly with Say's El. mancus. The basal fissure 

 of the thorax is more distinct than in the other species, in all of which it is almost wanting. 



B.— 1. 



2. D. oblongicollis, valde elongatus, fusco-niger, pubescens, thorace latitudine plus sesqui 

 longiore, lateribus parallelis, antice paulo rotundatis, confertim punctato, elytris striis punctatis, in- 

 terstitiis sat dense punctatis, antennis piceis, articulis 2 et 3 coniunctis 4 t0 fere brevioribus, pedibus 

 testaceis. Long. -31 — "35. 



Melsheimer, Proc. Acad. Nat. Sc. 2, 218. 



Middle States, not rare. The anterior margin of the thorax is sometimes testaceous. 



3. D. isabellinus, valde elongatus, luteo-testaceus, pubescens, capite antennisque fuscis, tho- 

 race latitudine sesqui longiore, lateribus parallelis, antice paulo rotundatis, minus subtiliter punctato, 

 elytris striis punctatis, interstitiis sat dense punctatis, antennis articulis 2 et 3 coniunctis 4'° fere bre- 

 vioribus. Long. *37. 



Melsheimer, Proc. Acad. Nat. Sc. 2, 218. 



Pennsylvania, I have seen only the typical specimen in Dr. Melshcimer's collection. 

 It differs from the preceding only by the coarser and less dense punctuation of the thorax. 



B.— 2*. 



4. D. c oil ar is, niger, pubescens, thorace latitudine longiore, postice subeanaliculato, lateribus 

 parallelis, antice rotundatis, confertim minus subtiliter punctato, lateribus late rufis, angulis posticis 

 elongatis, elytris testaceis, striis subtilius punctatis, interstitiis minus dense punctulatis, antennis pe- 

 dibusque rufo-tcstaceis. Long. - 49. 



Two specimens, Vermont, Prof. C. B. Adams. Size and form of the next species, and, 

 apart from colour, only distinguished from it by the less densely punctulate elytra. 



5. D. fucosus, ater, opacus, pubescens, thorace latitudine longiore postice subeanaliculato, la- 

 teribus parallelis, antice rotundatis, confertim minus subtiliter punctato, lateribus siepissime late ob- 



