354 CLAVICOr.NIA — scydmaenidae. 



II. Base of tliorax without distinct depressions, but 

 somewhat impressed transversely. 



Lighter or darker l)rown, antennae and legs yellow-brown. 

 Elytra oblong-oval, diflusely and feebly punctured, im- 

 pressed at base. L. | 1. Scarce. S. cxilis, Er. 



b. Thorax not much broader before middle than at base, 

 sides straight behind ; mandibles with short apex ; 

 second joint of labial palpi much longer than first. 



I, Thorax with a fine ridge and four dcjtressions at 

 base. 



1, Basal ridge on thorax short. 



A A, Tliorax impunctate. 



Pitch-black, antennae and legs brown-red. Elytra broad 

 oval, distinctly punctured, slioidders and space round scu- 

 tellum somewhat raised. L. i 1. Scarce. 



S. angulaius, Mlill. 



J* S, Thorax finely punctured. 



a a. Body red-brown. 



Elytra oblong oval, extremely finely and diffusely punc- 

 tured. L. I 1. Scarce. S. rubicund us, Schaum. 



b b. Body pitch-black. 



Antennae and legs Ijrown. Elytra oblong oval, distinctly 

 punctured, shoulders and space round scutellum raised. L. 

 f 1. Rather common. S. clongatulus, Mlill. 



2, Basal ridge on thorax extending until near tlie 

 middle of disc. 



Oblong-ovate, not very convex, shiny, pul>escence diffuse, 

 rather long, grayish. Pitch-brown ; antennae aiid legs 

 brownish-yellow. Thorax impunctate ; elytra oblong- 

 ovate, rather flat, very indistinctly or not at all punctured, 

 base of each with two depressions. Smaller than S. rubi- 

 cundns and elonyatalvs, with antennae shorter, more strongly 

 and less suddenly thickened at apex, with intermediate 

 joints less slender and less cylindrical, elytra less convex, 

 shoulders more prominent. L. ^ 1. Scarce. 



*S^. carinatus, Muls. 



II, Tliorax ^vith a parallel depression at base, ex- 

 tending a little way up each side, 



