430 REVISION OF THE ELATERID.TC 



Vermont, Prof. Adams; Illinois, Mr. Willcox. This very pretty little species is easily 

 distinguished by its brilliant metallic purple thorax: the antenna are longer than the head 

 and thorax, and serrate; the second and third joints are equal, and together equal in length to 

 the fourth : the anterior margin of the clypeus is reflexed, and almost straight. In the 

 larger specimen the punctures of the striae of the elytra are hardly larger than those of 

 the interstitial spaces: in both the base is transversely impressed. 



A.- y . 



5. L. in t ers ti t ialis, ameo-niger, griseo-pubescens, clypeo late ernarginato, thoracc latitudine 

 longiore dense punctato, angulis posticis carinatis paulo productis, elytris striis acutis, punctulatis, 

 interstitiis planis confertim punctatis, antennis pedibusque rufis. Long. - G. 



Corymbetis interstitial is Melsheimer, Proc. Acad. Nat. Sc. 2, 215. 



One specimen from Pennsylvania, in Dr. Melsheimer's collection. This only differs 

 from L. cylindriformis by its larger size, and more finely punctured elytral stria : I have 

 doubts of its being really distinct. 



6. L. cylindriformis, fusco-niger, dense fusco vel griseo-pubescens, clypeo late ernarginato, 

 thoracc latitudine longiore, dense punctato, angulis posticis carinatis, paulo productis, elytris striis 

 acutis parcius punctatis, interstitiis planis confertim punctulatis, basi margineque scope rufescentibus, 

 antennarum basi pedibusque rufis, illis stepe rufescentibus. Long. •! — "45. 



? Elater cylindriformis Hcrbst, Kiifer, 10, 93; tab. 16G, fig. 0. 



Mater cylindriformis Hay, Jour. Acad. Nat. Sc. 3, 176; Trans. Am. Phil. Soc. G, 1GG. 



Limonius lartieollis Melslieimer, Proc. Acad. Nat. Sc. 2, 215. 



Very abundant in the eastern part of the United States. Although the description given by 

 Say, above cited, may not be sufficient fully to identify this species, his subsequent obser- 

 vations, and the notes under his description of Eluter appressifrons (Ann. Lye. 1, 267,) 

 remove all doubt. Herbst's description seems rather to apply to this species, as the Co- 

 rymbetcs, to which it is referred by Germar, and which is El. appressifrons Say, has the 

 antenna nearly black, even at the base: the form of the clypeus is, unfortunately, not 

 mentioned. This determination is confirmed by Dr. Melsheimer, by whom specimens were 

 furnished to Say and Knoch: his L. hirticollis is, however, merely a large female of the 

 same species: it is curious that he should have placed it under a genus different from the 

 preceding closely allied species. 



7. L. confusus, tcneo-piceus, cinereo-pubescens, clypeo late rotundato, thoracc latitudine lon- 

 giore, antrorsum subangustato, lateribus vix rotundatis, punctato, posticc canaliculato, angulis posticis 

 brcvibus, subcarinatis, non divaricatis, elytris striis punctatis, interstitiis planis sat punctatis, pedibus 

 picco-rufis, antennis totis nigris. Long. *37. 



One specimen from Lake Superior, and another from New York. This species resem- 

 bles very closely the next, but may be distinguished by the moderately produced clypeus 

 being rounded anteriorly, not truncate: the antenna are entirely black, a little longer than 

 the head and thorax, serrate, with the second and third joints subequal, together a little 

 longer than the fourth: the thorax is distinctly but slightly narrowed in front, and scarcely 

 rounded on the sides: the epipleuiae are testaceous at the margin, and the thighs are darker 

 than the tibiae. 



