NORTH AMERICAN COLEOPTERA. 43 



fourth its width at base, wliich is rather strong ; the exposed surface 

 is strongly punctured and more distantly so than in either emargi- 

 natitm or piceum ; the terminal spurs of the anterior tibiae are arranged 

 as in the former species. 



E. carbonatlim n. sp. — Form moderately robust caiid convex, sides 

 parallel ; body devoid of setae iu tlie middle, at the sides of the elytra there 

 are a few widely scattered, robust hairs ; body black above, beneath the 

 abdomen is nearly black, the anterior portions paler, legs, antennae, and 

 mentum paler. Head much broader than long, punctures rather large, 

 round, variolate, evenly distributed, separated by less than their own widths ; 

 lateral sutures of epistoma distinct ; supra-orbital carinae well developed ; 

 anterior margin broadly and extremely feebly emarginate, sides broadly 

 rounded ; labrum rather feebly but distinctly emarginate, sides broadly 

 rounded ; antennae moderate, second joint two-thirds as long as the third, 

 third one-third longer than the fourth. Prothorax nearly twice as wide as 

 long ; anterior margin very slightly shorter than the base, tlie latter nearly 

 transverse, distinctly trisintiate, apex very feebly emarginate ; sides feebly 

 and evenly arcuate throughout ; anterior and posterior angles acute and 

 prominent ; disk distinctly margined anteriorly and posteriorly ; sides nar- 

 rowly reflexed, edges acute : punctures in the middle rather deeply impressed 

 and irregularly scattered, toward the sides becoming larger, more elongated, 

 closer, more shallow, and scabrous. Scutellum very minute. Elytra at base 

 very slightly wider than the contiguous pronotum ; sides parallel and almost 

 exactly straight for three-fourths the length from near the humeri ; disk 

 broadly convex, acutely rounded behind, more than three times as long as 

 the pronotum ; punctures very small, shallow, round, variolate, arranged in 

 very closely approximate rows, rather more distant in the rows than between 

 them, near the suture the rows become somewhat broken up and irregular; 

 the surface is minutely undulated, and near the suture the transverse 

 creases are very indistinctly apparent ; it is not visibly granulated, shining. 

 Under surface of abdomen finely punctate, punctures of the last segment 

 nuicli more closely crowded, very dense ; presternum sparsely, coarsely, and 

 evenly punctate. Legs moderate ; posterior tarsi shorter than the tibiae, 

 first joint slightly longer than the fourth ; first joint of the anterior tarsi 

 longer than the next two together. Last joint of maxillary palpi flattened 

 and strongly securiform. Length S.O mm. ; width 2.8 mm. 



Arizona (Morrison). 



The mentum is emarginate at apex ; the emargination is more 

 acutely rounded at bottom than at the sides, is rather strong, and 

 one-third as long as the width of the mentum at base ; the anterior 

 angles are broadly rounded, the exposed surface is strongly and 

 rather finely and closely punctate ; it is also rather feebly rugulose. 

 Mandibles strongly and unequally notched at tips. The terminal 

 spurs of the anterior tibiae are straight, strong, equal, and arranged 

 as in emarginatiim. 



