ii4 Memoirs on the Coleoptera 



Pronotum gibbous medially, but never at all abruptly; size more or less notably 

 small, the beak rather long, slender 33 



3 — Beak longer and thinner, generally about as long as the elytra, sometimes a 

 little shorter in the male 4 



Beak always distinctly shorter than the elytra and less slender, as a rule 19 



4 — Elytral striae deep, abrupt and groove-like 5 



Elytral striae feeble, finely and feebly punctulate 17 



5 — First three joints of the antennal funicle much elongated; prosternum appa- 

 rently not armed in the male 6 



First two joints not quite so elongate as a rule, the third through slightly elongate, 

 relatively very much shorter; antennae a little shorter, sometimes thicker; 

 prosternum not armed in the male so far as known 13 



6 — Elytral humeri notably prominent, extending well beyond the side limits of the 

 prothorax 7 



Elytral humeri feebly prominent, extending but little beyond the base of the pro- 

 thorax, which is relatively larger than usual ' 12 



7 — Prosternal channel broad, shallow and not sharply defined 8 



Prosternal channel narrower and deeper, abrupt and sharply defined; elytral 

 grooves becoming fine punctured striae at the sides II 



8 — Prothorax gradually broader and with feebly arcuate sides from constriction 

 to basal fifth, there rapidly rounded and thence slightly converging to the base. 

 Body sharply rhomboidal; beak strongly arcuate, cylindric, sparsely punc- 

 tate, more closely toward base, very nearly as long as the elytra, the antennae 

 at two- fifths, slender, obscure rufous, with narrow club; prothorax one-half 

 wider than long, punctured at base medially, the lobe very gradual; scutellum 

 transverse, smooth, feebly convex; elytra triangular, about as long as wide, 

 with feebly arcuate sides and narrowly rounded tip, less than twice as long 

 as the prothorax (cf ), nearly so ( 9 ), the grooves strong, minutely punctulate 

 along the bottom, more so as usual toward the sides; intervals smooth; 

 under surface moderately and sparsely punctate; male — if correctly identified 

 by a very slightly shorter beak and elytra — without prosternal spines, the 

 prosternum with rather plentiful pale squamules; anterior femora bispiculate 

 beneath. Length 6.4-7.5 mm.; width 4.2-5.0 mm. Brazil (Rio de Janeiro). 

 Three specimens rhombicus n. sp. 



Prothorax with subevenly arcuate sides from base to constriction; male appa- 

 rently without prosternal spines; antennae similarly inserted near basal two- 

 fifths 9 



9 — Metasternum with a deep elongate-oval central fossa. Body more narrowly 

 rhombic-suboval; beak slender, arcuate, over three-fourths as long as the 

 elytra, cylindric, finely, sparsely punctate, more coarsely and closely near 

 the base; antennae not quite so long, piceous, the third joint not quite twice 

 as long as wide; prothorax longer than usual, only two-fifths wider than 

 long, rather rapidly narrowing anteriorly, smooth throughout, except the 

 sparse punctures in the anterior constriction, the basal lobe broad, less 

 gradual, broadly and obtusely rounded; scutellum smaller, transverse; elytra 

 nearly a fourth longer than wide, parabolic, with broadly rounded apex, 

 hardly twice as long as the prothorax; grooves strong and deep, minutely 

 punctulate, the first three slightly dilated at base — not at all so in rhombicus; 

 under surface moderately and sparsely punctate, the abdomen impunctate, 

 except laterally; anterior femora with a single small sharp tooth at three- 

 fifths. Length 7.2 mm.; width 4.3 mm. Brazil (Chapada). December. 

 One specimen libertus n. sp. 



Metasternum finely sulcate along the median line as in rhombicus 10 



10 — Form sharply rhomboidal; beak slender, cylindric, strongly arcuate, as long 

 as the elytra, minutely, sparsely punctate, coarsely but not densely so at 



