150 [November, 1S44- 



very slightly contracted at hind angles, which are acute and not excurved ; me- 

 dial line very faintly indicated only at base: elytra very slightly striate, with the 

 interstices transversely and finely wrinkled : beneath and feet color as above. — 

 Must be closely allied to E. calceutus of Say, which is unknown to me. 



2. D. rujipes. Deep fuscous; feet testaceous; front longitudinally impressed. 

 2^ I. long, | 1. wide. Pennsylvania. 



Dark fuscous: head very minutely punctured, pubescent, with the front lon- 

 gitudinally impressed at tip; antennas fuscous, about half as long as the body, 

 with the basal joint as long as the head, not much more robust than the follow- 

 ing ones, second joint very small, subglobate, third longer than the fourth, ter- 

 minal longest, cylindric : thorax finely and densely punctured, densely pubescent, 

 slightly contracted at posterior angles, which are straight; medial line only very 

 faintly impressed at base :' elytra finely punctate, the striae obsolete behind the 

 middle, the interstices minutely punctured, and transversely rugulose ; sparsely 

 pubescent: feet rufous, or rufo-testaceous, with the fourth tarsal joint slightly 

 Cordate : beneath very finely pubescent. 



Elateridx. 

 Ctenonychts, Steph. — Cratonychus, Dej. 



1. C. spkenoidalis. Fuscous, pubescent ; antenna? and feet dull reddish- 

 brown. — 7 1. long, 2 1. wide. Pennsylvania. 



Gradually attenuated from the widest part of the thorax to apex of the 

 elytra, dark brown, pubescent ; front flat, coarsely and confertly punctured, 

 with the anterior edge elevated, acute and rounded : eyes ochraceous : an- 

 tennae longer than the thorax, dull reddish-brown, somewhat serrate, pubes- 

 cent : thorax a little wider towards the middle than the base of the elytra, 

 profoundly punctured, punctures numerous, crowded on the lateral margins; 

 sides slightly rounded before the middle ; hind angles not excurved, distinctly 

 and acutely carinated : scutel minutely punctured : elytra distinctly crenate- 

 striate, the interstices fiat, distantly and minutely punctured, and rough with 

 transverse rugae : beneath much punctured, black : feet dull reddish-brown. 

 The description of Cr. semulus by Prof. Erichson corresponds accurately 

 with the present species. 



2. C. ockraceipennis. Thorax and beneath rufous ; elytra testaceous or 

 ochreous. — 7 1. long, 2 1. wide. Pennsylvania. — Rare. 



Elater bicolor, Melsh. Catal. 



Head coarsely punctured, rufous pilose, with the front flat ; clypeus with 

 the anterior margin slightly elevated, obtusely rounded ; eyes black ; an- 

 tennae rufous, lanate : thorax some wider than long, wider behind than at 

 apex, with the sides rounded ; punctured, punctures large, profound, vicinal 

 on the disk, and dense and rugose on the lateral margins ; posterior angles 

 acute, hardly excurved, distinctly and obliquely carinated ; rufous, with the 

 lateral edges blackish ; ochreous hirsute ; medial line faint at base : elytra 

 yellowish testaceous, tinged with rufous, hirsute like the thorax ; gradually 

 narrowed from the base to the apex, puuctate-striate, interstices more flat 



