THE ANT-LIKE STONE BEETLES. 297 



g. Elytra strongly impressecl each side of suture near base, 

 ft. Elytra long, rather acutely pointed behind, fully one- 

 half longer than wide ; blackish-piceous in color ; length 



2 mm. LONGIPENNE. 



hh. Elytra shorter, more obtuse at ajie.x. less than one-half 

 longer than wide, dull red, clouded with blackish be- 

 hind ; length 1.9 mm. 575. formale. 

 gg. Elytra feebly or not at all impressed on basal half ; black, 

 tibije paler, tarsi yellowish. 576. flavitaese. 

 ff. Species less than l.'i mm. in length ; thorax shorter than 

 wide, with sides straight; piceous black, the elytra paler. 



DENTIGEa. 



ee. Clypeal tooth very minute. 



/. Suture nut at all elevated or beaded toward liase, the su))- 



sutural impressions obsolete ; black, elytra red, blackish 



toward tips. 577. fossiger. 



/('. Suture more or less beaded toward base, the impressions 



long and distinct; liudy black throughout. femokale. 



(}(l. Elytral pubescence coarse, sh-.rter and recurved. 



j. Antennae stout, not longer than head and thorax, strongly cla- 



vate, the next to last .ioints very transverse. 



/i. Larger, 1.4—1.6 mm.; basal fnveje of elytra stroii.i;, the outer 



large. .'578. clavicosne. 



7i7r. Smaller, not over 1.2 mm.; l)asal fovese small and feeble; an- 



tennal club more nearl.v 3-jointed. 579. abdicen.s. 



ij. Antenn:c rather slender, much longer than head and thcirax. 



the next to last joints fully us long as wide; Imdy narrowly 



oval, pale dull yellow throughout. fuetiviim. 



fc. Clypeus without trace of median tooth. 



I. Thorax without distinct transverse impression at base ; elytral 

 suture beaded toward base, the pubescence long, even and sub- 

 erect ; color black. 580. iNTEORr Ji. 

 U. Thorax with a distinct interrupted impression near base. 

 m. Body more inflated ; el^'tra always distinctly more than one- 

 half wider than thorax, the suture with a broad bead which 

 is broadly expanded at base ; blackish-piceous, elytra dark 

 reddish-yellow. ixnoouum. 

 mm. Body narrow and elongate, but convex ; elytra almost one-half 

 wider than thorax, the latter with transverse impression 

 strong; head large, nearly as wide as thorax. 



581. clavatdm. 

 66. Antennal club 3-,iointed. abrupt; length not over 1 mm. 



II. Clypeal tooth well developed, narrow and acute; autenuiTe stouter; 

 color dull brownish-yellow. 582, dedilitans. 



nn. Clyijeal tooth very minute, short and obtuse; antennal funicle 

 much more slender; hind body narrowly oval; pale chestnut 

 brown. 583. FtiLvxiM. 



f. Basal .joint of hind tarsi elongate, always distinctly longer than sec- 

 ond, joints one to four decreasing rapidly in length ; hind tibise of 

 male with a slender terminal spur. 



