NORTH AMERICAN COLEOPTERA. 41 



Arizona (Morrison). 



Tlie mentum in this species is very large, strongly rounded ante- 

 riorly, with a very short, rounded, and somewhat feeble eniargination 

 at the immediate apex ; its exposed surface is deeply and closely 

 punctate. There is but one specimen before me, but it appears to be 

 very distinct from any with which it has been compared. The punc- 

 tures of the elytra, although equidistant among themselves, can, in 

 the middle of the disk, be very readily caused by the eye to arrange 

 themselves in striae-like rows. 



E. emargiliatum n. sp. — Form rather elongated, convex ; pubescence 

 almost entirely absent from the head and pronotum, on the elytra it consists 

 of erect, coarse, evenly distributed, and sparse setae, which are piceo-cinere- 

 ous in color ; general color of the body dark piceous-brown, nearly black 

 above, very slightly paler beneath, antennae and legs extremely dark rufo- 

 testaceous. Head moderate, slightly wider than long ; interocular surface 

 very convex between the eyes, then broadly declivous, becoming transversely 

 and very feebly ridged just behind the anterior margin, the latter squarely 

 truncate in the middle, rounded at the sides ; punctures of head very sparse 

 in the middle, denser toward the sides, very dense and deeper near the 

 anterior margin ; supra-ocular ridges rather short but very distinct ; labrum 

 just visibly emarginate in the middle, provided anteriorly with a dense fringe 

 of porrected setae, broadly rounded at the sides ; antennae as long as the 

 anterior width of prothorax, third joint just visibly longer than the fourth, 

 joints five to seven shorter, sub-equal, joints eight to ten wider, flattened, 

 sub-triangular, increasing in size, ninth and tenth notched at the apex, 

 eleventh longer than wide, narrower, regularly oval. Prothorax nearly 

 twice as wide as long, base just perceptibly longer than the apex, evenly 

 and feebly arcuate at the sides, broadly and very feebly emarginate through- 

 out anteriorly, very feebly trisinuate posteriorly ; anterior and posterior 

 angles very acute ; disk very convex, feebly and rather closely punctate ; at 

 the sides the punctures become longer, more shallow, closer, and more vario- 

 late. Scutellum as in E. piceum. Elytra at base just perceptibly wider than 

 the base of the pronotum ; sides very feebly divergent and nearly straight 

 for three-fourths of the length from the humeri ; disk very convex, more 

 than three times as long as the prothorax, rather acutely rounded behind, 

 very feebly and narrowly impressed on the suture toward the base, feebly 

 and minutely punctate ; punctures sparse, nearly evenly distributed, easily 

 caused to form striae-like rows by the eye, very feebly impressed ; the entire 

 disk is also finely, rather strongly, and transversely rugulose. Under sur- 

 face of the abdomen finely punctate, much more closely so on the last segment ; 

 prosternum coarsely pitted, much more sparsely so in the middle. Legs 

 moderate ; first and last joints of the posterior tarsi equal in length, slightly 

 longer than the second and third together. Length 6.0 mm. 



Arizona (Morrison). 



The mentum of emarginatiim is very large, coarsely, and closely 

 punctured, broadly rounded anteriorly, except for a space at the apex 



