Platynin.e 41 



Prothorax with the reflexed sides more sinuate basally, the angles right 



and very sharply defined 22 



22 — Head and prothorax testaceous, the elytra piceous-black. Shining 

 and with testaceous reflexed margins; under surface, the legs and 

 antennae more or less pale ferruginous; head slightly elongate, 

 much narrower than the prothorax, with well developed and promi- 

 nent eyes and rather deep parallel anterior impressions; antenna 

 not quite so long or slender as in the cincticollis type; prothorax a 

 fourth wider than long, the sides subevenly rounded and broadly 

 reflexed, feebly sinuate basally, the base broadly and feebly arcu- 

 ate, as wide as the apex, which is moderately sinuate, with broadly 

 rounded angles; surface almost as in cincticollis, except that the 

 anterior prolongation of the large and deeply concave, nearly 

 smooth foveae is rather more distant from the sides; elytra slightly 

 more than one-half longer than wide, not quite twice as wide as the 

 prothorax, gradually rounding behind, the sinus long and feeble 

 but distinct; suture minutely mucronate at apex; stride smooth, 

 very fine, coarser at tip, the intervals flat; surface not impressed 

 posteriorly; met-episterna much elongated; anterior male tarsi 

 moderately dilated. Length (cf 9) 8.8-10.8 mm.; width 3.3-4.1 

 mm. Southern California and Arizona. Abundant. [PL hicolor 



Lee. II ] bicoloratus G. & H. 



Head and prothorax never distinctly paler than the elytra 23 



23 — Foveal region of the pronotum nearly smooth 24 



Foveal region coarsely and deeply punctato-rugose 25 



24 — Form rather stout, moderately convex, shining, black, piceous 

 beneath; head nearly similar but a little wider and with shallower 

 and more indefinite anterior impressions; antennae testaceous, not 

 quite half as long as the body, the joints blackish toward their 

 apices; prothorax larger than in bicoloratus and rather less widely 

 reflexed at the sides, otherwise nearly similar, except that the basal 

 angles are even more acutely and denticulately prominent; sides 

 diaphanously pale; elytra formed nearly as in bicoloratus but larger, 

 the striae less fine, the intervals similarly nearly flat, the suture 

 micro-mucronate at apex; anterior male tarsi very moderately 

 dilated; tarsal claws longer. Length (c?' 9) 9.0-10.5 mm.; width 

 3-3-4-2 mm. Middle California and adjacent parts of Nevada. 

 Abundant. [PI. tenebricosus G. & H.; ma rginatus Men€t.; rugiceps 



Mann, and cinctellus Lee] brunneomarginatus Mann. 



Form less stout, smaller in size, moderately convex, shining, black, the 

 under surface and legs black; head slightly elongate, subtriangular, 

 with rather wider neck, nearly three-fourths as wide as the pro- 

 thorax, the eyes rather prominent but much smaller than in the 

 preceding; anterior impressions rather broad, slightly oblique; 

 antenna? about half as long as the body, nearly black, with the 

 extreme base of the joints pallescent; prothorax still shorter, nearly 

 a third wider than long, the sides barely at all paler, broadly, strongly 

 reflexed, strongly rounded, oblique and distinctly sinuate basally, 

 the angles nearly right, sharply defined; base feebly arcuate, as 

 wide as the apex, which is moderately sinuate, with rather distinct 



