356 MEMOIRS ON THE COLEOPTERA 



arcuate, straighter and rather more oblique along the outer side of 

 the large basal angles, the apical angles as in the preceding; surface 

 rather depressed, sometimes with a very obsolete median impressed 

 line, the punctures generally not very coarse, close-set except as 

 above stated; scutellum with coarse, dense, extremely shallow 

 areolae; elytra a fourth wider than the prothorax, moderately elon- 

 gate, with very broadly rounded apical angles, the humeri rather 

 small and slightly prominent laterally; surface not quite flat and 

 not very abruptly descending at the sides, the opaque areolae only 

 moderate to small in size, rather elongate and well separated, more 

 even on the broader elytra of the female; pygidium strongly convex, 

 with large rounded flat opaque areolae, which are well separated and 

 slightly impressed, the apical part polished and sparsely punctulate 

 as usual; hind tarsi two-thirds as long as the tibiae, only moderately 

 compressed and slightly though evidently tapering, the last joint 

 nearly one-half longer than the fourth, the bidentate anterior tibiae 

 as usual in the angularis section. Length 10.5-11.2 mm.; width 

 4.7-5.1 mm. Washington State (Pullman), W.M.Mann. Found 

 in the nests of a large pale brown ant, having the abdomen inflated 

 and dark piceous in color obliquus n. sp. 



Pronotum evenly punctate; elytral areolae subeven in size 16 



1 6 Hind tarsi evidently tapering, strongly compressed and about two- 

 thirds to nearly three-fourths as long as the tibiae, but not compact in 

 structure and with the second joint always distinctly longer than 

 wide 17 



-Hind tarsi very short, though more than half as long as the tibiae, 

 strongly tapering, extremely compressed and rather compact, the 

 second joint scarcely as long as wide 18 



17 Hind tarsi moderately slender, somewhat tapering on the flat side, 

 strongly compressed, two-thirds as long as the tibiae and with the 

 joints much less elongate than in armatus, the second only a fourth 

 longer than wide; body narrower and slightly more elongate than in 

 armatus, similar in color, but with shorter erect hair; head and clypeus 

 similar, the latter rather less abruptly but strongly reflexed; pro- 

 thorax broader, fully one-half wider than long, the parallel sides more 

 evenly arcuate, widest at about the middle, the surface and apical 

 and basal angles nearly similar; scutellum almost similar but with 

 the foveolae less coarse and usually a little deeper; elytra distinctly 

 more elongate, rather more than one-half longer than wide, sub- 

 parallel or very feebly cuneiform, the surface almost as in armatus 

 but with the somewhat flatter disk more abruptly declivous at the 

 sides, the foveolae similar but not quite so large, usually close-set, 

 smaller, deep and well separated to rather dense along the sides; 

 pygidium dull, with large opaque areolae, becoming shining and 

 sparsely punctulate apically; anterior tibiae and moderately variolate 

 under surface nearly similar; elytra with small irregular tomentose 

 spots and one more conspicuous and transverse at the sides behind the 

 middle as usual in this section, the spots generally visible only when 

 the surface is free from exuded grease. Length 10.0-12.0 mm.; 

 width 4.6-5.2 mm. California (Placer the type locality, El 



