OCR Text |
Show 1905.] OF PHYTOPHAGOUS COLEOPTERA. 419 surrounded and separated by very narrow spaces or bands of the ground-colour ; under side and legs pale piceous ; claw-joint moderately swollen. Hab. Bolivia ; also Brazil. Of this species I have seen a great many specimens of most variable coloration, some of which have the elytral bands very dark in regard to the basal and subapical ones, and the intermediate bands pale or absent altogether and entire or divided into two spots as described here. It is possible that the species is identical with A . albida Schauf. Genus O e d io n y c h is . Elytra entirely pole-coloured or nearly so. O e d io n y ch is r o tu n d ic o l l is , sp. n. Broadly ovate, subdepressed, pale testaceous; antennae and the posterior femora obscure piceous ; sides of thorax strongly rounded, broadly flattened, impunctate ; elytra extremely minutely punctured. Length 8 millim. Head impunctate, frontal elevations transverse ; antennae pale piceous, the third joint slightly shorter than the fourth and following joints ; thorax about twice and a half broader than long, the sides strongly rounded and broadly flattened, the anterior angles strongly pointed but scarcely dentiform, the surface impunctate; elytra broadly ovate, the margins narrowly reflexed, the base with a very shallow depression, the surface scarcely perceptibly punctured ; posterior femora pale piceous. Hab. Espirito Santo, Brazil. The sides of the thorax in this species are more rounded than in any of the unicolorous members of the genus with which I am acquainted ; the elytra are likewise of more broadly rounded shape than usual. O e d io n y ch is p a r a g u a y e n s is , sp. n. Short and convex, testaceous ; apical joints of the antennae black ; thorax densely and strongly punctured, the sides not deeply flattened ; elytra punctured like the thorax. Length 7 millim. Head somewhat closely punctured, frontal elevations oblique, carina short and broad ; antennae scarcely extending to the middle of the elytra, the lower three joints testaceous, the others black, third and following joints nearly equal, rather elongate; thorax twice as broad as long, the lateral margins feebly but evenly rounded, the anterior angles produced outwards into a small tooth, the surface rugosely and rather strongly punctured, the sides gradually and rather shallowly flattened ; scutellum black; elytra rather strongly convex below the middle, sculptured like the thorax ; legs short and robust. |