COI.EOPTERA. 77 



Prothorax as wide as, or wider than long. 



Legs black throughout; longitudinal elevation of interocular surface evenly 

 convex. 

 Pronotum having a longitudinal ridge-like elevation at the sides of the 



canaliculation ; body very robust 58. COStaJis. 



Pronotum not ridged ; body much more slender 59. alveolatiis. 



Femora distinctly rufo-fuscous ; longitudinal elevation of interocular sur- 

 face acute ; pronotum having very obscure lateral ridges. 



00. elliptic us. 



Prothorax narrower than long. 



Sides of pronotum feebly arcuate-, prothorax sub-cylindrical, very dis- 

 tinctly narrower than long 61. adelops. 



Sides of pronotum strongly arcuate anteriorly; prothorax very slightly 

 narrower than long o2. litcttiosus. 



58. S. COStalis n. sp. — Form very robust. Pubescence line, close, semi- 

 erect, rather short, piceous-brown, not conspicuous. Head robust, small, 

 twice as wide as long; interocular surface more than twice as wide as the 

 eye. nearly flat, equally trilobed by the very distinct sulcations, lobes equally 

 and evenly convex ; punctures tin.', very even and close, finer in the middle; 

 ocular lines meeting at one length in advance; antennae slightly longer 

 than the width of head, slender, club large, piceous-black ; third joint some- 

 what more than one-third as long again as the fourth, fourth and fifth sub- 

 equal, joints six, seven, and eight sub-equal in length, the latter oval in 

 outline, joints of club robust, last two slightly wider than the ninth, last 

 joint but slightly longer than wide; maxillary palpi long, piceous-black. 

 Prothorax robust, widest distinctly before the middle, where it is nearly live- 

 sixths as wide as the head, and slightly broader than long ; sides thence 

 moderately convergent posteriorly ami rather strongly sinuate ; anterior 

 margin shorter and much more arcuate than the posterior ; surface strongly 

 swollen along the sides and at the edges of the canaliculation, giving the 

 appearance of four longitudinal ribs, strongly and transversely impressed 

 just behind the anterior margin ; finely, very closely, evenly, though very 

 confusedly and roughly sculptured ; canaliculation distinct, deeply impressed, 

 terminating at equal distances from the margins, two-thirds as long as the 

 pronotum. Elytra at base much wider than the head; sides: very feebly 

 divergent posteriorly, just perceptibly longer than the width at base, dis- 

 tinctly arcuate; together broadly, rather strongly, and triangularly emargi- 

 nate behind ; suture one-half as long again as the pronotum ; surface rather 

 broadly and strongly impressed on the suture at the base, very finely, ex- 

 ceedingly closely and irregularly sculptured ; punctures almost entirely 

 coalescent in very long and devious channels, with occasional spots where 

 they are confusedly broken up; they generally pursue a longitudinal or 

 oblique direction. Abdominal segments very broad, rapidly and arcuately 

 diminishing in width, first nearly as wide as the contiguous elytra; surface 

 shining, feebly convex, rather finely punctulate, more finely so behind ; 

 transverse carinae tricuspid, middle cusps short and tapering, lateral broad 

 and somewhat rudimentary. Legs rather short and slender, piceous-black ; 

 first joint of the posterior tarsi three-fifths as long again as the second, as 



