484 Memoirs on the Coleoptera 



funicular joint nearly as long as the next three, the second as long 

 as the succeeding two, the outer joints not materially broadened, 

 the club abrupt, elongate-oval, pubescent, with feeble sutures and 

 as long as the preceding five joints. Prosternum broadly but not 

 very sharply channeled, separating the coxae by about their own 

 width, the posterior lobe large and broad, feebly sinuate medially. 

 Prothorax feebly tubulate, the basal lobe small, short and rounded, 

 the scutellum not very free, medially impressed, subquadrate and 

 slightly transverse, the elytra moderately grooved, the surface with 

 two very faint undulations at the sides, and the pygidium small, 

 rounded and moderately convex. The type is as follows: 



Thanius perpolitus n. sp. — Convex, oval, highly polished, smooth and feebly 

 sculptured, glabrous; beak evidently longer than the head and prothorax, moder- 

 ately and evenly arcuate, rather slender, coarsely and densely punctate, more 

 finely and sparsely distad; antennae slender, piceous; prothorax barely a fifth 

 wider than long, the sides slightly converging and nearly straight, rounding in 

 apical fourth to the feeble constriction, the oblique tubulation more than half as 

 wide as the base; punctures fine and sparse, a little coarser but still separated 

 by about twice their diameters at the sides; median smooth line feeble and partial; 

 elytra rather obtusely oval, nearly a third longer than wide, at the moderately 

 tumid humeri slightly wider than the prothorax, fully three-fourths longer; 

 grooves a third to fourth as wide as the intervals and with widely separated 

 punctures indenting the sides of the latter, which have single series of widely 

 spaced and extremely minute punctules; pygidium evenly convex; legs moderate, 

 the femora slightly thick, the tarsi slender, with long claw-joint. Length 3.3-3.4 

 mm.; width 1. 45-1. 5 mm. Brazil (Rio Grande do Sul). Four specimens. 



Easily recognizable by the rather smooth and polished, wholly 

 glabrous surface above and the long, somewhat slender but strongly 

 and closely punctate beak. 



Mesothanius n. gen. 



Again a monotypic genus seems to be necessary for a similarly 

 small, smooth, polished, feebly sculptured but more parallel species, 

 entirely glabrous above, excepting a small spot of close-set slender 

 white scales at the base of the third interval, and a few scattered 

 over the elytral surface, perhaps betraying an affinity with the 

 Pseudobarid series. The beak is rather short and somewhat thick, 

 cylindric, feebly separated and finely, loosely punctate; antennas 

 slightly behind the middle, rather short, the first funicular joint not 

 quite as long as the next three, the others short, increasing in 

 width, so that the seventh is almost as wide as the club, which is 

 short, oval, as long as the four preceding joints, with its basal 

 segment sparsely pubescent, large and constituting more than half 

 the mass. Prosternum short, with a deep and sharply defined 

 canal, continued by shallow concavity between the coxae and 



