COLEOPTERA. 67 



placidus were at first described as three or four distinct species, and 

 T have suppressed all but tliose here given in order to satisfy my mind 

 more completely of the validity of at least these typical representa- 

 tives. The series of specimens are scarcely large enough to admit of 

 conclusive judgment, but I am almost convinced that I have under- 

 stated the number of species. 



48. S. erieiisis n. sp. — Form as in placidus. Pubescence short, fine, 

 semi-erect, setiform, rather sparse, cinereous, coarser and longer on the 

 elytra than on the prothorax and head. Head robust, twice as wide as long ; 

 interocular surface twice as wide as the eye, nearly flat, finely, very closely 

 and rather evenly punctate ; punctures more distant along the middle : 

 longitudinal elevation as wide as lateral portions, broadly and feebly con- 

 vex ; ocular lines meeting at one length in advance ; antennae slender, dark 

 piceous, basal joint black, club moderate ; third joint one-third as long again 

 as the fourth, fourth and fifth equal, sixth somewhat longer and narrower 

 than the seventh, eighth very slightly elongate, as. wide as the seventh, 

 middle joint of club widest ; maxillary palpi piceous, first joint much paler. 

 Prothorax robust, widest at one-half the length posteriorly, where it is four- 

 fiftlis as wide as the head, and very slightly narrower than long ; sides thence 

 moderately convergent and straight ; anterior margin longer than posterior, 

 equally arcuate ; surface somewhat tuberculate at the sides, finely, closely, 

 and evenly punctate, interspaces one-third as wide as the punctures, very 

 convex, polished ; canaliculation just visible as an irregular and short erosion 

 of the surface just behind the middle. Elytra at base as wide as the head ; 

 sides very moderately divergent posteriorly, very slightly longer than the 

 width at base and feebly arcuate ; together broadly and very feebly emargi- 

 nate behind ; suture nearly one-fifth as long again as the pronotum ; surface 

 very feebly impressed along the suture, rather coarsely, very closely, deeply, 

 and somewhat irregularly punctate; punctures in contact longitudinally 

 behind and near the suture, sometimes isolated anteriorly. Abdominal 

 segments decreasing uniformly and quite rapidly in width, first as wide as 

 the contiguous elytra ; surface broadly convex, rather coarsely and irregu- 

 larly punctulate, more distantly so in the middle of the segments, and more 

 finely toward the vertex ; transverse carinae tricuspid, middle cusps long 

 and finely aciculate, lateral very small, distant, and rudimentary. Legs 

 moderate, dark piceous-brown ; first joint of the posterior tarsi four-fifths as 

 long again as the second, as long as the next two together, last joint much 

 longer than the first, as long as the second, third and fourth together. Under 

 surface of the abdomen dark piceous, finely punctulate. Body winged. 



Male. — Posterior edge of the fourth ventral segment emarginate in its 

 middle third, emargination evenly rounded and just perceptible, contiguous 

 surface flattened and bordered with long setae ; fifth segment emarginate in 

 its middle fourth at apex, emargination very evenly rounded, five to six times 

 as wide as deep, contiguous surface flattened and bordered with long setae . 

 sixth segment sinuate at apex, sinus sharply rounded, twice as wide as deep, 

 sinus and vertices equal in extent. 



Female. — Unknown. 



Length 2.4-2.6 mm. 



