NORTH AMERICAN COLEOPTERA. 41 



H. sufflatus Lee. (Card.) loc. cit. p. 499. 

 H. simplex Lee. New Species 1863, p. 83. 



H. curiatus Say {Elater) Trans. Am. Phil. Soc. vi, p. 173; Lee. loc .cit. p. 500 ; 

 Cand. Elat. iii, p. 265. 



areolatus Eriehs. (Card.) Zeitschr. ii, p. 320. 

 H. gracilis n. sp. 



H. exoletus Eriehs {Card.) loe. eit. p. 325 ; Cand. loe. cit. p. 257. 

 H. Uhlerii Horn loc. cit. p. 302. 

 H. mitis n. sp. 



ESTHESOPIJS Eseh. 



To this genus belong those Cardiophori in which the side margin of 

 the thorax is acute from the base nearly to the apex and the fourth tarsal 

 joint dilated and somewhat lobed beneath. 



In all the species the claws are similar to those of the second group 

 of Horistonotus, that is they are squarely dentate from the middle to the 

 base. The humeri are in all cases distinct, the sides of the elytra con- 

 tinuous with the sides of the thorax and not forming an entering angle 

 as in many Horistonotus. The surface is finely and sparsely pubescent. 

 The surface of the thorax has the same intermixed punctuation which is 

 always fine and inconspicuous except in praeditus. 



The following table will assist in the identification of our species, two 

 only of which are really new, while two others have been long known but 

 erroneously determined in the Check List : 



Thorax with small but distinct basal plicae claricollis. 



Thorax without basal plicae. 



Color uniform, ferruginous or pieeous. 



Coarser punctures of thorax larger and more numerous along the sides and 

 base ..prseditus. 



Coarser punctures finer and less numerous at sides and base. 



Uniformly brown parcus. 



Ferruginous, more shining. 



More robust, elytral intervals biserrately punctulate dispersiis. 



Sub-depressed, intervals with one series of punctures piisio. 



Bieolored ; body beneath, head and thorax reddish, elytra black ....bicolor. 

 E. claricollis Say. — Form moderately robust and shining, sparsely clothed 

 witli cinereous pubescence, pieeous, antennse and legs rufo-testaceous. Antennae 

 slender, extending slightly beyond the hind angles of the thorax. Head convex, 

 punctuation rather dense and intermixed. Thorax a little longer than wide, nar- 

 rower in front, sides nearly parallel posteriorly, arcuate anteriorly, hind angles 

 not divergent, basal plicae small but distinct, disc convex rather shining, punctua- 

 tion close but very fine and intermixed, somewhat more distinct at the sides. 

 Elytra not wider than the thorax, a little more than twice as long, humeri dis- 

 tinct, sides feebly arcuate, narrowing at apical third, surface striate, striae rather 

 coarsely and moderately closely punctate, intervals slightly convex, and indis- 

 tinctly closely punctulate. Body beneath slightly paler than above, moderately 

 closely punctate, the punctures intermixed. Length .28 inch ; 7 mm. 



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