46G REVISION OF THE ELATERIDyE 



One specimen, Vermont, Prof. Adams. Body black, with very little lustre, covered with 

 brownish hair. Head very densely punctured; antennae with the third joint triangular, 

 about twice as long as the second, but not more than half the size of the fourth : last joint not 

 constricted. Thorax not longer than wide, narrowed gradually from the base, and broadly 

 rounded on the sides, moderately convex, very densely punctured, punctures becoming con- 

 fluent towards the sides: posterior angles less elongate than usual, elytra slightly nar- 

 rowed from the very base, more strongly narrowed posteriorly, pale dirty yellow, with a 

 large apical black blotch, the anterior limits of which are badly defined, and which ex- 

 tends farther along the side than on the suture: stria? deep, strongly punctured, interstices 

 convex, moderately and finely punctured. 



This species differs from the following not only by the apical blotch of the elytra ex- 

 tending to the apex and side, but by its more densely punctured thorax, with shorter posterior 

 angles, and by the less parallel elytra: the last is probably a sexual character. 



12. E. apicatus, niger, helvo-pubescens, tliorace confertim punctata, elytris Ircte sanguineis, 

 plaga utrinque apicali oblonga nigra, striis profundis punctatis, interstitiis convexis, disperse punc- 

 tatis, antennis piceis (feminae) articulo 8 10 secundo fere duplo longiore. Long. "35 — - 46. 



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



Ampedus melanopygua Germ. Zeitschr. 5, 161. 



Northern portions of the United States. I have only females of this species, but from 

 the relation which the joints bear to each other, the male probably has antenna? like the 

 preceding species; the apical black spot of the elytra is well defined, and does not touch 

 either the side or suture. 



13. E. phoenicopterus, niger, helvo-pubescens, thorace confertim punctate-, elytris sanguineo- 

 ferrugineis, striis punctatis, interstitiis fere planis ruguloso-punctatis, antennis vix piceis, (femina?) 

 articulo 3 io secundo fere duplo longiore. Long. -43 — '5. 



Ampedus phoenicopterus Germ. Zeitschr. 5, 1G1. 



Oregon and Lake Superior. Having compared specimens, I have been convinced of 

 their identity. This species is very closely allied to the last, but the colour of the elytra 

 is more obscure, and without spots: the thorax is more convex and more rounded on the 

 sides: the difference in the depth of the elytral stria? and the punctuation of the interstices 

 is not as obvious as would appear in Germar's description: I find that there is some 

 variation in this respect in different specimens, though the interstices are never as convex 

 as in the preceding. 



14. E. luctuosus, atcr, griseo-pubescens, thorace confertim punctato, postice canalicular, 

 elytris striis profundis punctatis, interstitiis confertim rugose punctulatis, antennis articulo 3'° secundo 

 vix longiore, pedibusque piceis. Long. -43 — "5. 



Lake Superior, at Eagle Harbour. This species is extremely similar to the next, but the 

 third joint of the antenna? in both sexes is much shorter than the fourth and hardly longer 

 than the second. The elytra are less tapering, being almost parallel anteriorly, as in the 

 preceding two species. The thorax is narrowed from the base, and moderately rounded 

 on the sides: in the female it is a little broader than long, in the male its diameters arc 

 about equal. 



