80 Memoirs on the Coleoptera 



rather closely punctured; prothorax between a fourth and third wider than 

 long, the strongly converging sides feebly, subevenly arcuate to the sub- 

 tubulate apex, which is more than half as wide as the base; surface and 

 flanks nearly as in the preceding; basal lobe moderate and truncate, with 

 about two punctures near each oblique edge, the lateral impressions at base 

 feeble but evident, wanting in stygialis; scutellum minute, subquadrate, 

 the sinuate apex somewhat wider than the base; elytra internally with rather 

 wide but shallow, catenulate striae, obsolete but with evident series of minute 

 punctures laterally, 9 and 10 distinct, catenulate; legs strongly but loosely 

 punctate, feebly setulose. Length 1.7 mm.; width 1.1 mm. Brazil (Entre 

 Rios). September. One specimen semiruber n. sp. 



All of these species have peculiarities of form or sculpture that 

 will enable them to be recognized easily if rediscovered, but there 

 are probably scores still undiscovered ; minutus is one of the smallest 

 species of the entire subfamily. 



Group V. 

 Subgenus Hiotomicrus nov. 



Two species are separated below under this subgeneric name, 

 primarily because of the relatively smaller antennal club, which is 

 however oval and subequally segmented, the first segment very 

 much less than half the mass. There are, however, several other 

 peculiarities, such as the subobliterated suture between the meta- 

 sternum and met-episterna, smooth flat abdomen, at least in the 

 type, and slender, apically bent and often serrulate femora. The 

 hind tibiae are rounded on the external edge basallyas in Spermidius. 

 The type is the first described below: 



Form elongate-suboval, polished and smooth, black, the legs and elytra more or 

 less piceous; beak rather thick, arcuate, scarcely compressed, strongly, 

 sparsely punctate, finely and remotely so above, and as long as the prothorax, 

 the transverse basal impression deeply anguliform, the head impunctate; 

 antennal club scarcely more than half as long as the funicle; prothorax 

 slightly shorter than wide, the converging sides nearly straight to apical 

 third, there abruptly angulate and thence oblique and straight to the wholly 

 unconstricted apex, which is nearly half as wide as the base; surface and 

 inferior flanks impunctate, the basal lobe small and feeble, rounded, simple; 

 scutellum very small, oblong, smooth; elytra two-fifths longer than wide,' 

 but little wider than the prothorax, the sides parallel basally, thence oblique 

 and barely arcuate to the very narrowly rounded apex; striae obsolete, the 

 surface very smooth, the sutural stria very fine and feeble, 9 and 10 obsolete, 

 but suddenly becoming coarse, shallow and catenulate posteriad; under 

 surface very smooth, the first two abdominal segments flat, polished and 

 impunctate, the others each with a transverse line of small remote punctures; 

 legs slender, the femora deflexed at apex, coarsely, rugosely sculptured and 

 setulose. Length 1.7 mm.; width 1.0 mm. Brazil (Santarem). One 

 specimen laeviventris n. sp. 



Form narrowly oval, attenuate behind, shining black, the legs and elytra piceous; 

 beak moderately stout and sculptured, arcuate, subcylindric, shorter than 

 the prothorax, the antennal club as in the preceding; prothorax nearly as 



