462 REVISION OF THE ELATERID.E 



anterior portion of the front are distinct, but more distant than in the preceding species; 

 the antennae are only slightly serrate, and the third joint is not as wide as the fourth; the 

 carina of the posterior angles of the thorax reaches almost to the middle; the first joint, 

 especially of the anterior tarsi, is longer in proportion than in the preceding species; the 

 second joint appears to be lobed, but I am not certain that it is so; the third joint is 

 nearly as long as the second, and extends beneath into a lohe, beyond the fourth joint, 

 which is very small; the fifth is as long as the three preceding, with small slender nails. 



Say describes the tarsi as having the penultimate joint lobed, but as the present, species 

 agrees in every other respect with his description, I think we may be justified in consi- 

 dering his observation as an error. 



B. Frons non crislata. 



3. D. ferreus, rufo-piceus, longius helvo-pilosus, fronte concava, thorace parce grossius punctato, 

 latitudine vix longiore, antrorsum angustato, et lateribus paulo rotundato, spatio dorsali indistincto 

 lrevi, elytris postice angustatis, striis punctatis, interstitiis subconvexis parce punctatis. Long. -56. 



One specimen, Texas, Lieut. Haldeman. The front is more produced than in D. rami- 

 cornis, and is slightly concave above; the posterior angles of the thorax are carinated, 

 but the carina is less acute than in that species. The lobes of the tarsi extend to the 

 middle of the last joint. The antennae are blackish and formed exactly as in the female 

 of D. ramicornis, but are a little broader. The punctures of the thorax are distant in the 

 middle, but moderately close on the sides; there is a rounded indistinct smooth dorsal 

 space behind the middle. 



4. D. soleatus, supra castaneus, helvo-pilosus, fronte subconcava, thorace grossius, lateribus den- 

 sius punctato, latitudine longiore, antrorsum angustato, lateribus rectis, antice paulo rotundatis, ely- 

 tris subparallelis, postice rotundatis, striis punctatis, interstitiis parce punctatis, postpectore, abdo- 

 mine, antennis pedibusque rufis. Long. -45. 



Mater soleatus Say, Trans. Am. Phil. Soc. 6, 176. 



One specimen, Michigan. This species is closely related to the preceding, but the 

 more densely punctured thorax, and rufous antenna 1 , distinguish it at once; the thorax is 

 more narrowed anteriorly, and less rounded on the sides; the posterior angles are more 

 acutely carinated. 



Say states that the second joint of the antenna; is "not more than half the length of the 

 third;" in my specimen, as in the preceding and next species, it is only about one-third 

 as long as the third joint. 



5. D. simplex, piceus, helvo-pilosus, fronte vix concava, thorace minus dense punctato, postice 

 canaliculato, antrorsum angustato, lateribus parum rotundatis, clytris striis fortius punctatis, inter- 

 stitiis planis parce punctulatis, antennis rufo-piceis, pcdibus testaceis. Long. -35. 



One specimen, Texas, Lieut. Haldeman. From D. ferrous it is distinguished by its 

 smaller size, brown antennas, unimpressed front, and testaceous feet; from D. soleatus by 

 the less densely punctured thorax, the less deep and more strongly punctured strire of the 

 elytra, and by the deeper colour of the under surface. The carina of the posterior angles 

 of the thorax is as acute as in I), soleatus. 



