NORTH AMERICAN COLEOPTERA. 13 



Rhode Island ; Willets Point, Long Island. 



This species has the same arrangement of setae upon the epistoma 

 as lustralis, but they are more widely separated in other characters 

 than any other two members of this rather singular group. 



In the series of four specimens which I have before me, the males 

 and females are equally divided. There is no perceptible variation 

 among them dependent upon sex, except in the usual strong dilata- 

 tion of the tarsal joints in the male. 



SEI.E1V0PHORUS. 



S. aeneopiceilS n. sp. — Form nearly as in pedicularius Dej. Color above 

 piceo-aeneous, beneath slightly paler, piceous, paler toward the head, legs 

 and antennae very pale plceo-testaceous, the latter nearly uniform through- 

 out. Head nearly as broad as long, convex ; eyes small ; supra-orbital seta 

 long, slender, and situated opposite a point of the eye about one-fourth the 

 length of the latter from its posterior extremity ; labrum paler in color ; 

 sides convergent anteriorly ; antennae shorter than the head and prothorax 

 together, second joint nearly three-fo-urths as long as the third, joints seven 

 to ten equal in length, and two-thirds as long as the last ; emargination of 

 mentum very deep, evenly rounded at the bottom, parabolic ; on the edges 

 of the emargination, near the bottom and somewhat distantly separated, 

 there are two short stout setae ; on the sub-mentum there are four setae, 

 two at each extremity, all approximately on the same transverse line. Pro- 

 thorax widest slightly in advance of the middle, where it is nearly one-half 

 wider than long ; sides rather strongly arcuate, most strongly so anteriorly; 

 apical angles broadly rounded, basal rounded but less broadly so ; anterior 

 and posterior margins nearly transverse and straight ; disk much more 

 transversely convex anteriorly than posteriorly, polished, minutely reticu- 

 lated, narrowly margined throughout its circumference, impunctate at the 

 base; median line very fine and becoming obsolete near the bases; basal 

 impressions feeble and irregular. Elytra at base as wide as the contiguous 

 pronotum; sides divergent and arcuate near the humeri, thence parallel 

 and very feebly arcuate for three-fifths the entire length ; together acutely 

 rounded behind ; disk strongly declivous at the sides, about three times as 

 long as the pronotum, slightly less than twice as long as wide ; striae finely 

 impressed, intervals very feebly convex, polished, minutely reticulated ; 

 punctures of second, fifth, and seventh striae distinct, impressed, rather 

 small. First joint of posterior tarsi fully as long as the next three together. 

 Length 6.1-6. (j mm. 



Arizona (Morrison). 



The erect setiform pubescence around the exterior edges of the 

 elytral disk is sparse and very limited in extent ; not as dense as in 

 pedicidartus. 



The three species gagatinvs, pedicula7-ri(s, and ceneopicens, which 

 resemble each other more or less, may be separated by the posterior 

 tarsi as follows : — 



