56 Memoirs on the Coleoptera 



him very small, narrow, canaliculate from base to apex; elytra distinctly 

 longer than wide, about twice as long as the prothorax and a fifth or sixth 

 wider, evenly oval, the humeri but slightly swollen and not laterally promi- 

 nent; striae rather coarse, deep and sulciform throughout, finely punctate 

 along the bottom; intervals flat, with single loose series of punctures, so 

 infinitesimal as to be discovered with difficulty; under surface, except the 

 nearly smooth abdomen, coarsely and closely punctate throughout, the legs 

 short, closely punctate, the tarsi loosely received within the outer sulcus of 

 the tibiae; first abdominal suture extremely fine, the other three coarse, 

 finer and reflexed at the sides. Length 2.0 mm.; width 1.2 mm. Brazil 



(Santarem). One specimen angustipes n. sp. 



Body ovoidal; surface deep black, highly polished, the beak rufous distally, as 

 long as the head and prothorax, stout and arcuate basally, straighter, nar- 

 rower and smoother in about distal half, separated from the head by a dis- 

 tinct impression; punctures very minute and sparse, stronger at the sides 

 basally; antennae at two-fifths, the basal funicular joint long and thick, the 

 club nearly as in the preceding species, large, though shorter than the funicle, 

 oval, densely pubescent, with distinct sutures, the four segments equal in 

 length among themselves; prothorax very highly polished and completely 

 impunctate throughout above and beneath, a third wider than long, the sides 

 feebly converging and slightly arcuate, gradually more rounding and con- 

 verging anteriorly to the tubulation, which is fully half as wide as the base, 

 the basal lobe moderate, narrowly truncate, smooth, unimpressed ; scutellum 

 small, quadrate, smooth, feebly concave; elytra fully a fourth longer than 

 wide, barely a fifth wider than the prothorax, very evenly and narrowly para- 

 bolic, without subapical convexities, the humeri broadly rounded, not promi- 

 nent; grooves coarse, deep and very abrupt, impunctate, the intervals flat 

 and smooth; abdomen even, rather strongly but not very closely punctate 

 throughout; tibiae slender, rounded externally toward base, not at all dentate; 

 tarsi rather slender, the claws straight, well developed, connate at base. 

 Length 2.25 mm.; width 1.2 mm. Brazil (Santarem). One specimen. 



subovalis n. sp. 



There is no way to determine the sex of these unique types, but 

 it is probably male in angustipes and female in subovalis. In the 

 former the tibiae externally at base are oblique and sharply, rather 

 prominently angulate; subovalis has very much the external facies 

 of the genus Prodinus. 



Matrilia n. gen. 



Another very isolated small species here begins a series of Diory- 

 merid genera differing from those thus far considered in having 

 the tarsal claws slender, arcuate and free; they are well developed 

 in the present genus, but become very small in some others. The 

 anterior coxae are separated by a third to nearly half their width, 

 closer in the male, and the excavation before them is well defined 

 but only moderately deep. The body is very small, convex, 

 glabrous and pallid, the abdomen apparently simple at base, the 

 tibiae straight, oblique and externally subdentate at base, and the 

 third tarsal joint is well dilated. The scutellum is peculiar, very 

 small, rather narrower than long, canaliculate, with flaring cuspidi- 

 form apical angles and, at the middle of each side, having an 



