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Show 1905.] OF PHYTOPHAGOUS COLEOPTERA. 423 0. navicular is, but is of more elongate and less convex .shape and is much larger; the thorax is longer and less transverse. O e d io n y ch is e c u a d o r ie n s is , sp. n. Broadly ovate, the head, antennae, and the under side black; thorax flavous, impunctate; elytra obscure pale fulvous with slight purplish shade, extremely finely punctured. Length 8 millim. Head with a few fine punctures near the eyes, finely granulate, black, the frontal elevations pyriform, divided by a deep groove; clypeus flavous ; eyes very large, but not closely approached; antennae black, the basal three joints more or less testaceous above, third joint slightly shorter than the fourth ; thorax with strongly rounded and broadly flattened sides, the anterior angles acute but scarcely produced, the disc rather convex, flavous, impunctate ; scutellum triangular, fulvous ; elytra widened towards the middle, with broadly reflexed margins, the latter pale ; the disc obscure fulvous with a slight purplish tint, very finely and closely punctured; under side and legs black or piceous; metatarsus very short, claw-joint strongly swollen. Hah. Ecuador. This is a species of peculiarly dull appearance, unless this is caused by discoloration. The two specimens before me are, however, entirely similar in this respect, the shape is rather broadly ovate, and the elytral margins are proportionately broad. Oe d io n y ch is r h o d in a , sp. n. Oblong, nearly parallel, black; thorax rather short, testaceous, impunctate, the sides gradually flattened ; elytra without prominent shoulders, testaceous, impunctate. Length 7-7 g millim. Head impunctate, black; frontal tubercles broad, ill-defined ; eyes widely separated, with a few punctures placed between them; clypeus very short, strongly deflexed ; antennae not extending to the middle of the elytra, black, the third and following joints equal, terminal joints elongate ; thorax rather short, the sides rounded anteriorly, the anterior margin concave, anterior angles produced into a short, blunt tooth, the disc impunctate, shining, testaceous, the sides flattened, but this portion limited within by a shallow sulcus only; scutellum more or less piceous at the base; elytra slightly wider at the base than the thorax, rather elongate, feebly widened only towards the middle, the shoulders but slightly prominent and bounded within by a shallow depression only, the surface nearly impunctate ; below and the legs black. Hab. Espirito Santo, Brazil. A rather larger species, and principally differing in the less strongly flattened sides of the thorax, the oblong shape of the elytra and their less prominent shoulders and almost impunctate surface. P roc. Z ool. S oc.- 1 9 0 5 , Y o l . II. N o. XXIX. 29 |
