/8 NORTH AMERICAN COLEOPTERA. 



covered mixerl with a series of S. opallnvs in my cabinet. It differs 

 from (liat species in its mudi less transverse protliorax, whicli is very 

 densely and closely punctate at base, in its relatively -more slender 

 form, particularly of tbe head, and in its scarcely perceptibly opales- 

 cent elytra. In the male tiie distance between the apical angles of 

 the pronotum is slightly less than the length of base. 



STEIVOLOPHIIS Dej. 



S. scif IlllIS n. sp. — Form slightly robust, about two and one-half timfs 

 as long as wide, somewhat depressed. Color above black throughout, be- 

 neath piceous-black, scarcely paler ; legs pale testaceous ; antennae brown, 

 testaceous at base; oral organs dark rufo-testaceous, strongly translucent. 

 Head moderate, as wide as long ; eyes large, prominent ; interocular surface 

 four times as wide as the eye, polished, inipunctate, nearly tlat, having on 

 each side, at a short distance from the anterior limit of the eye, a short 

 curvate, oblique, and distinctly marked canaliculation ; epistomal setae far 

 from the anterior angles : labrum very short, over four times as wide as long, 

 angles rounded, very broailly and feebly sinuate anteriorly ; mandibles very 

 short, robust, abruptly and finely acuminate at tip, feebly arcuate ; para- 

 glossae excessively thi-n and transparent ; third joint of the maxillary palpi 

 very short, scarcely more than one-half as long as the last, which is robust 

 and gradually and finely acuminate ; third joint of labial palpi one-third 

 longer tlian the second, rather robust, obliquely and finely acuminate ; gular 

 support of the meutum bearing a long seta at each side near the centre ; 

 ligula obtusely and broadly arcuate anteriorly, having four discal setae ; 

 antennae distinctly longer than the head and protliorax together, very 

 slender, second joint two-thirds as long as the third, third and fourth equal 

 in length, the former slightly more slender. Prothorax nearly one-half 

 wider than tlie head ; base and apex equal in length, the former very feebly 

 sinuate in the middle, the latter broadly and strongly sinuate; anterior 

 angles rather acutely rounded ; basal angles obsolete, very broadly rounded, 

 continuous in curvature with the sides and base; disk slightly wider than 

 long, feebly convex; sides moderately and nearly evenly arcuate; margin 

 narrowly reflexed, disai)pearing toward the middle of the base ; medial 

 groove distinctly marked, narrow, extending from base to apex ; surface im- 

 punctate, polished, very finely, feebly, and sparsely punctulate in a limited 

 area on each side of the nnddle at the base where the disk is also very 

 broadly and feebly impressed ; at each side at one-third the length from the 

 apical an<;les there is a long erect seta. Scutellum small, wider than long. 

 Elytra at base very slightly wider than the pronotum ; sides parallel, evenly 

 and moderately arcuate for four-fifths the length posteriorly, abruptly, 

 evenly, and very obtusely rounded behind ; inner apical angles rounded ; 

 disk slightly more than one-half longer than the head and prothorax 

 lo'u'ther, broadly convex, minutely and feebly granulose, polished; striae 

 very fine; intervals nearly flat ; scutellar stria between the first and second 

 elvtral striae rather long; at «me-fourth the length from the apices there is 

 a ndnute setigerous puncture on each elytron just beyond the second stria. 



