464 REVISION OF THE ELATERID.K 



convex) always distinct and angulated: the first joint of the antenna? short, the second 

 small, the third longer and wider than the second, usually much narrower than the fourth, 

 but varying in this respect both in species and sex: the joints 4 — 10 triangular, decreasing 

 slightly in breadth, eleventh oval, not constricted. Presternum with the lateral suture an- 

 teriorly excavated for the reception of the antennas. 



4. E. r ubr i coll is, atcr opacus, helvo-pubescens, capite thoracoque confertissime fere scabro- 

 punctatis, obscure sanguineis, elytris striis profundis punctatis, intcrstitiis convexis confertim punc- 

 tatis, antennarum articulo 3 10 prrecedente duplo longiore, subtriangulari. Long. -5 — "58. 



Herbst, Kafer, 10, 40, tab. 102, fig. 6, (1801;) Say, Joura. Acad. Nat. Sc. 3, 177; Harris, Trans. 



Hartford Soc. Nat. Hist. 71. 

 Elater verticinus Bcauvois, Ins. 214, tab. 9, fig. 6, (1805;) Say, Ann. Lye. 1, 2G8. 

 Ampedus rubricollis Germ. Zeitscbr. 5, 171. 



Middle, Southern, and Western States; not rare in Georgia. The last joint of the an- 

 tenna) is slightly sinuate or constricted beyond the middle. 



5. E. nigricollis, ater cinereo-pubescens, tborace confertim punctato, versus latera fere sca- 

 bro, elytris pallidis subcuneatis, striis profundis punctatis, intcrstitiis subconvexis punctulatis, pedibus 

 testaceis, antennarum articulo 3'° pnecedente duplo maiore triangulavi. Long. *33 — -42. 



Herbst, Kafer, 10, 73, tab. 164, fig. 7; Say, Journ. Acad. Nat. Sc. 3, 176. 

 Ampedus nigricollis Germ. Zeitscbr. 5, 166. 



Middle and Southern States, not rare. The base of the antenna; is indistinctly testa- 

 ceous: the third joint is considerably dilated, though not as large or as broad as the fourth: 

 the last joint of the antenna) is not at all constricted. 



6. E. 1 into us, ater cinereo-pubescens, capite confertissime, tborace confertim punctato, versus 

 latera fere scabro, elytris cuneatis pallidis, puncto humerali, sutura, apiceque nigris, striis profun- 

 dis punctatis, intcrstitiis subconvexis parce punctatis, antennarum maris articulo 3'° sequenti fere icquali. 

 Long. -35— -42. 



Say, Trans. Am. Phil. Soc. 6, 168. 

 Ampedus luguhris Germ. Zeitscbr. 5, 165. 



Middle and Southern States, and Lake Superior. The outer margin of the elytra is 

 black. This species is subject to some variation: a specimen from Vermont has the legs 

 testaceous, and the head less densely punctured than usual: in other specimens the head 

 is almost scabrous: the female has the antenna) shorter, and the third joint much less di- 

 lated than the others. Gcrmar docs not cite Say's description; and although the species 

 has long been known under the name proposed by Bcauvois, I cannot find any description 

 in his writings. 



7. E. discoidcus, atcr, griseo-pubescens, capite tboraccque opacis, confertim punctatis, versus 

 latera fere seabris, elytris cuneatis, basi margineque flavo-fulvis, striis profundis punctatis, intcrstitiis 

 subconvexis rugose punctatis, antonnarum maris articulo 3 io sequenti subrequali. Long. -42 — *38. 



Pabr. Syst. El. 2, 210; Herbst, Kafer, 10, 132. 



Ampedus diseoideus Germ. Zeitschr. 5, 165. 



Southern States, not rare. The female has the third joint of the antenna) very slightly 

 dilated, and about twice the length of the second. 



