Brazilian Baring 33 



terior tibiae obtusely dentate externally at basal third, the femora not denticu- 

 late; scutellum very small, convex, transversely subquadrate; pronotum 

 peculiar in being abruptly elevated medially toward base. [Type Diorymerus 

 monoceros Boh.] Eulophodes 



Presternum abruptly and deeply sulcate, the channel not quite large enough to 

 receive the basal part of the beak, which is still thicker, more cylindric and 

 strongly sculptured, the mandibles wholly different, straight and prominent 

 as in Centrinus; antennal club small, oval, truncate at base, pointed apically, 

 densely clothed, the basal segment half the mass; tibiae rounded externally 

 at base, never dentate; femora minutely spiculate beneath; third tarsal joint 

 well dilated; abdomen in both sexes with a smaller median basal plaque than 

 in Diorymerus, not well defined at the sides and very moderately impressed 

 along the middle; body in general aspect nearly as in Diorymerus, moderate 

 in size, with transverse scutellum. [Type I. plenicollis nov.] Idiopsida 



Presternum very much more narrowly sulcate, the beak short, stout, with small 

 decussate mandibles, the antennal club large, very stout, oval, more shining 

 and with distinct sutures; abdomen wholly unmodified at base; tibiae short, 

 angulate externally at base, the femora unarmed; third tarsal joint much 

 more narrowly dilated; body very small in size, oval, with punctured pro- 

 notum, very small canaliculate scutellum and coarsely grooved elytra. 

 [Type C. angustipes.) Crepantis 



4 — Beak as usual in the tribe, its upper surface continuous with the front, not 

 cylindric and always notably sculptured 5 



Beak somewhat as in Balaninus, arcuate, cylindric, nearly smooth and attached 

 at the lower part of the head 8 



5 — Mandibles short, coming together on an even straight line, prominent at apex 

 and also sublaterally; presternum broadly and abruptly but not very deeply 

 excavated before the coxae; antennal club small, rounded; claws relatively 

 rather large, widely free; beak short or moderate in length, differing greatly 

 in the sexes; elytra grooved; scutellum small, channeled; prothorax tubu- 

 late at apex; body small in size. [M. diversirostris nov.] Matrilia 



Mandibles decussate, arcuate, acutely bifid at tip as a rule 6 



6 — Prothorax shouldered anteriorly, rapidly tubulate at apex; abdomen more 

 punctured but not distinctly swollen at base; integuments sometimes setu- 

 lose at least in part; prosternal canal deep and abrupt but often not as wide 

 as the beak; antennal club oval; scutellum small; elytra always grooved. 

 [Type P. abruptus nov.] Prodinus 



Prothorax not shouldered, having evenly arcuate converging sides from the base 

 to the more or less evident sinus at the sides of the apex 7 



7 — Body, rather elongate, rhomboidal in outline; prothorax broadly tubulate at 

 apex; presternum and antennae as in Diorymerus; sculpture almost wanting 

 throughout, the integuments brightly polished and metallic; legs slender, the 

 femora parallel; base of the abdomen flat, smooth and unmodified. [Type 

 B. aneoviridis nov.] Bonomius 



Body oval, moderate to minute in size, the prothorax with much more narrowly 

 or obsoletely tubulate apex; presternum as in Diorymerus, the antennal 

 club smaller, more oval, also less compact as a rule though variable; integu- 

 ments deep black, rufo-piceous or sharply bicolored, very smooth and 

 glabrous; femora relatively not quite so narrow; base of the abdomen 

 generally swollen and coarsely, densely sculptured. [Type H. in flatus nov.] 



Hiotus 



8 — Body and presternum somewhat as in Hiotus, the former however more 

 rhomboidal, with much more sharply marked humeri; antennae similar, the 

 club elongate-oval; mandibles similar, decussate, with bifid tips; abdomen 

 not distinctly swollen, though strongly punctured and setulose at base; 



tarsi small, glabrous above. [Type G. filirostris nov.] Genestus 



T. L. Casey, Mem. Col. X, Aug. 1922. 



