Brazilian Baring 261 



type — Centrinus geminns Pasc.— there is a rounded or oblique 

 medial spot of dense narrow fulvous scales, but in other species the 

 elytral vestiture may form a basal and a post-medial irregular 

 fascia, or the upper surface in rare cases may be completely glabrous. 

 The beak is long and strongly, subevenly arcuate, sometimes 

 cylindric and sparsely punctured throughout, or compressed at the 

 sides basally and more coarsely, closely sculptured and separated 

 from the head by a feeble to rather deep broad reentrant angle. 

 The antennae are rather long and slender, submedial in insertion 

 and with notably elongate first funicular joint, the club elongate- 

 oval and never noticeably thick, the sutures distinct. The anterior 

 coxae are moderately to widely separated, the prosternum abruptly 

 but not very widely or deeply canalate, often with a deep anterior 

 rounded fossa, bearing (o 71 ) two spines, well developed to vestigial, 

 and, when large, always broader and compressed toward base. The 

 legs are slender, the tibiae straight, the prothorax abruptly tubulate 

 at apex and the elytra almost sculptureless to deeply grooved. 

 The species are rather numerous and unusually diversified in 

 appearance, those at present in my collection forming four sub- 

 generic groups, as follows: 



Elytra each with a median fulvous spot of dense scales, the striae obsolete or nearly 

 so basally; abdomen finely, sparsely punctate; male prosternum conspicu- 

 ously armed. Typical Dimesus I 



Elytra and entire upper surface completely glabrous, the striae obsolete only at 

 the base; abdomen closely punctate; prosternal spines of the male con- 

 spicuous II 



Elytra with basal and post-median squamosity, the stria deep, entire and groove- 

 like — at least in the female; abdomen closely punctate; male prosternum 

 moderately to vestigially armed; body stouter Ill 



Elytra wholly glabrous, excepting a short squamose line behind the scutelliim 

 and sometimes at the sides of the latter; prosternal spines wanting or ex- 

 tremely vestigial IV 



I — Body oblong-suboval, strongly convex, smooth, polished and deep black 

 throughout, the fulvous spots on the elytra rounded, sometimes mutually 

 tangent at the suture; under surface with fine and sparse, white squamules, 

 less sparse on the metasternum and larger at the sides of the prosternal 

 canal; beak (<?) cylindric, evenly and strongly arcuate, feebly tapering, 

 moderately and remotely punctate and polished, two-thirds as long as the 

 body; antenna? slender, rufous and medial, the scape extending barely more 

 than half way to the eye, the first funicular joint as long as the next three, 

 the elongate-oval club about as long as the preceding five joints; prothorax 

 large, subquadrate, scarcely a fifth wider than long, the subparallel sides 

 evenly and distinctly arcuate, gradually more strongly rounding anteriorly 

 to the tubulation, which is very much less than half as wide as the base; 

 base more arcuate medially but not lobed; surface very smooth; scutellum 

 smooth, transversely quadrate, free behind but scarcely so at the sides; 

 elytra a third longer than wide, a fifth wider than the prothorax and two- 

 thirds longer, the oblique sides feebly arcuate, subsinuate just before the 

 rather narrow but obtusely rounded apex; grooves deep, obsolescent in 

 basal third; male abdomen broadly, feebly impressed or flattened medio- 



