176 MEMOIRS ON THE COLEOPTERA 



notably high pedestal and almost completely clears the still shorter 

 sides of the opening; three species have been discovered thus far. 



Hind angles of the prothorax very obtuse and somewhat rounded 2 



Hind angles less obtuse to subacute and scarcely at all blunt, always very 

 distinct 3 



2 Body brownish, subopaque, sparsely clothed with very short erect 

 pubescence, which is yellowish on the head, brownish elsewhere; 

 head sparsely punctate; prothorax one-third broader than long, 

 the apex as wide as the base and feebly sinuate, the sides very regu- 

 larly arcuate, with the margin feebly reflexed; hind angles obtusely 

 rounded, the base truncate, the surface feebly convex, sparsely and 

 very regularly punctured medially, more densely at the sides; elytra 

 oblong-oval, the humeri broadly rounded, the apex feebly attenuate, 

 the sides rounded, without margin; surface regularly convex, sub- 

 opaque, sparsely and very finely punctate; under surface subopaque, 

 sparsely and finely punctate; anterior tibiae denticulate on the outer 

 margin. Length 12.0 mm. Utah (St. George). [Asida acerba Horn.] 



acerba Horn 



3 Anterior tibiae not evidently serrulate externally [cf. Horn, under 

 description of acerba]. Body black, sparsely clothed with short 

 flavate setse; head punctate; prothorax punctate, sparsely muricate 

 medially, the sides slightly rounded, the margin barely at all reflexed, 

 the base rounded, the angles well marked; elytra sparsely and finely 

 muricate, submargined, oval, the apex acute, strongly declivous. 

 Length 12.5 mm. California (desert along the Colorado River). 

 [Pelecyphorns hispiditlus Lee.] hispidula Lee. 



Anterior tibiae evidently but loosely spinulo-serrate externally, the external 

 apical angle much smaller than in acerba but very acute, the flavate 

 setae longer; elytra sensibly margined at the sides in the male but 

 very obtuse in the female; eyes very convex and prominent; sides 

 of the head before the eyes very prominent in both sexes, extending 

 laterally as far as the eyes; body rather slender, more ventricose 

 in the female, dark brown, subopaque; head feebly impressed, 

 strongly, rather closely punctate, the erect hairs sparse but distinct; 

 prothorax similar in the sexes, fully two-thirds wider than long, 

 parallel and moderately rounded at the sides, straight or subsinuate 

 near the apical angles, which are rather acute but not produced, 

 the apex scarcely narrower than the base, much less deeply sinuate 

 than in acerba; base broadly, feebly arcuate medially, the angles 

 evidently somewhat obtuse but not at all rounded; surface evenly 

 and moderately convex, shining to subopaque throughout, minutely, 

 simply and sparsely punctate medially, with the interspaces ex- 

 tremely minutely and closely punctulate, gradually rather coarsely 

 and closely perforato-punctate laterally, the sides very gradually 

 declivo-explanate, the edge thin and very feebly reflexed; setae 

 sparse, moderately short; elytra two-fifths (cf) to two-thirds (9) 

 wider than the prothorax, two-thirds to one-half longer than wide, 

 oblong-ovoidal, somewhat wider posteriorly, convex, subopaque, 



