444 Memoirs on the Coleoptera 



and laterally, but elsewhere with very moderate, well separated punctuation; 

 under surface rather coarsely, densely punctate, the abdomen finely, shallowly 

 and sparsely so, having a large and very shallow basal impression in the male. 

 Length 5.0 mm.; width 2.35 mm. Brazil (Santarem). One specimen. 



Does not seem to be at all closely related to any other species 

 known to me at present. 



Plasiliopsis n. gen. 



This genus differs very much from the preceding in having the 

 body small in size, convex, narrowed anteriad and obtuse behind, 

 polished, glabrous and feebly sculptured. Beak rather short, thick, 

 feebly arcuate, finely, sparsely punctulate, separated by a shallow 

 reentrant angle and with decussate mandibles. Antennae near the 

 lower margin slightly behind the middle, with short scape, the first 

 funicular joint as long as the next three, the outer joints short and 

 compact, the club elongate-oval, pubescent, as long as the five 

 preceding joints and subequally divided by the sutures. Prester- 

 num with a deep, shining and sharply limited canal and very short, 

 broadly arcuate, smooth posterior lobe, the coxae moderately 

 separated. The legs are rather slender, feebly sculptured, with 

 slightly arcuate tibiae and small slender tarsi, the claws straight 

 and contiguous. Prothorax conical, not tubulate at apex, the basal 

 lobe very short and small, broadly sinuato-truncate, the scutellum 

 close-set, flat, subquadrate and ogivally pointed; elytra with even 

 surface and fine sharp grooves, the pygidium peculiar — small and 

 short, prominently and transversely ridged just above the middle 

 and with a medially interrupted transverse impression below the 

 ridge in the female, but not so short, with evenly and more convex 

 surface below the transverse angulation in the male. First ventral 

 suture obliterated medially. The two species are as follows: 



Body narrowly ovoidal, convex, polished, glabrous and black throughout; beak 

 thick, barely as long as the prothorax, the antennae piceous; prothorax 

 evenly conical, a fourth wider than long, the sides just visibly arcuate, the 

 truncate apex fully half as wide as the base, not tubulate; punctures fine and 

 sparse throughout, becoming obsolete basally; elytra obtusely oval, not 

 quite a third longer than wide, behind the base evidently wider than the 

 prothorax, nearly twice as long, the sides but feebly oblique and evenly 

 arcuate, rather rapidly broadly rounded at apex, the humeral prominences 

 very feeble and diffuse; striae feebly and remotely punctulate, equally fine 

 throughout, shallow and about a sixth as wide as the intervals, which are 

 flat and sparsely, infinitesimally punctulate; pygidium somewhat closely, 

 strongly punctate; under surface sparsely and moderately, shallowly punc- 

 tate, the male abdomen feebly impressed toward base along the middle. 

 Length 2.55-2.65 mm.; width 1.15-1.2 mm. Brazil (Santarem). Five 

 specimens laevis n. sp. 



Body larger in size and more broadly oval, glabrous, similar in color and lustre; 

 beak (cf) nearly similar, but still thicker and a little more bent basally, 



