72 Memoirs on the Coleoptera 



only moderately swollen and less coarsely, more loosely punctate. Length 

 3.8 mm.; width 2.75 mm. Brazil (Pernambuco). DesbrochersdesLoges. One 



specimen, labeled "cardinatus" vulsus n. sp. 



14 — Form almost evenly oval, the humeri very slightly prominent; beak only 

 moderately thick and arcuate, not quite as long as the prothorax, subcy- 

 lindric and closely, but not very coarsely, punctate, so closely reposing in the 

 sulcus in the type, that the antennae are not visible; prothorax only just 

 visibly wider than long, the sides converging and feebly arcuate, gradually 

 more so anteriad, the apex not at all tubulate and two-fifths as wide as the 

 base; surface very sparsely punctate, minutely so discally, more coarsely 

 laterad, and thence down the entire inferior flanks coarsely and closely; 

 basal lobe moderate, very evenly rounded, strongly punctate, without lateral 

 impressions; scutellum very small, wider than long, punctulate; elytra dis- 

 tinctly longer than wide, about a sixth wider than the prothorax, ogival, 

 narrowly rounded at tip; striae deeply grooved, very abrupt, minutely punctu- 

 late along the bottom, 7 and 8 finer and feebler; legs moderately punctate, 

 the hind femora rather inflated, feebly serrulate along the lower edge, the 

 external tibial tooth triangular and sharp; first ventral strongly tumid and 

 coarsely, densely punctate. Length 2.25 mm.; width 1.45 mm. Brazil 

 (Santarem). One specimen retractus n. sp. 



The species bear a very strong external resemblance among 

 themselves, but striking structural differences are numerous and 

 readily observable. 



Group III. 



Subgenus Hiotopsis nov. 



The numerous species of this subgeneric group are related rather 

 closely in general organization to the preceding, but are much more 

 minute in size and of more narrowly oval outline. The first ventral 

 segment is subsimilarly tumid as a rule, and the prosternal canal 

 before the coxae nearly similar, as are also the externally basally 

 dentate or angulate hind tibiae. In certain rare cases the hind 

 femora are minutely denticulate beneath. The antennal club is 

 well developed, elongate-oval, about as long as the six preceding 

 joints as a rule, as in the preceding group, and similarly with the 

 sutures much more evident than in Diorymerus, the basal segment 

 very much less than half the mass. The species now at hand may 

 be known easily by the following characters: 



Elytra with the discal striae wholly obsolete, or excessively fine and barely visible . 2 



Elytral striae distinct, at least internally 5 



Elytral striae coarser, deeply grooved or sulciform 11 



2 — Prothorax completely impunctate throughout the dorsal and ventral surfaces, 

 except a very faint basal series; sutural stria of the elytra turned outwardly 



along the base to or even beyond the middle 3 



Prothorax impunctate dorsally, but having distinct punctures on the lower parts 



of the flanks beneath; sutural stria not at all turned outward at base 4 



3 — Pronotum with a regular single series of minute punctures along the basal 

 margin, except laterally; body feebly subrhomboid-oval, very smooth and 

 highly polished, black throughout, the elytra sometimes with barely visible 



