THE ANT-LIKE STONE BEETLES. 



297 



g. Elytra strongly impressed each side of suture near base. 

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

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

 2 mm. longipenne. 

 hli. Elytra shorter, more obtuse at apex, less than one-half 

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

 hind ; length 1.9 mm. 575. forma le. 

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

 tibiae paler, tarsi yellowish. 576. flavitarse. 

 ff. Species less than 1.3 mm. in length; thorax shorter than 

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



DENTIGER. 



ee. Clypeal tooth very minute. 



i. Suture not at all elevated or beaded toward base, the sub- 



sutural impressions obsolete; black, elytra red, blackish 

 toward tips. 577. fossiger. 



ii. Suture more or less beaded toward base, the impressions 



long and distinct ; body black throughout. femorale. 

 eld. Elytral pubescence coarse, shorter and recurved. 



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

 vate, the next to last joints very transverse. 

 k. Larger, 1.4-1.6 mm. ; basal foveae of elytra strong, the outer 

 large. 578. clavicorne. 



kk. Smaller, not over 1.2 mm. ; basal fovese small and feeble; an- 

 tennal club more nearly 3-jointed. 579. abducens. 



jj. Antenna? rather slender, much longer than head and thorax, 

 the next to last joints fully as long as wide; body narrowly 

 oval, pale dull yellow throughout. furtivum. 

 cc. 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. integrum. 



II. Thorax with a distinct interrupted impression near base. 



m. Body more inflated; elytra 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. innocuum. 

 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. clavatum. 

 Antennal club 3-jointed. abrupt ; length not over 1 mm. 

 n. Clypeal tooth well developed, narrow and acute ; antennae stouter ; 

 color dull brownish-yellow. 582. debilitans. 



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

 much more slender; hind body narrowly oval; pale chestnut 

 brown. 583. fulvum. 



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

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

 male with a slender terminal spur. 



