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Show 574 MR. M. JACOBY ON NEW [NOV. 1, 03DIONYCHIS CLYPEATA, n. sp. Flavous ; the antennae (the lower four joints excepted) and the tarsi black ; clypeus strongly produced ; thorax impunctate ; elytra scarcely perceptibly punctured, obscure fulvous. Length 2\ lines. Head impunctate, the frontal tubercles entirely absent, the space between the eyes deeply excavated ; the clypeus produced, flattened and truncate at the apex ; the antennae extending to about half the length of the elytra, black, the lower four joints fulvous, the basal joint widened, nearly subquadrate and short, the second one half the size, the third and fourth equal, the terminal joints slightly thickened ; thorax strongly transverse, not narrowed in front, the sides rounded, with a distinct flattened margin, the anterior angles pointed, the disc unevenly raised at the sides, with several depressions, entirely impunctate ; elytra minutely punctured, darker than the thorax ; legs flavous; tbe knees and the tarsi black; posterior claw-joint strongly swollen, black. This differs from all the Madagascar species of (Edionychis described in the structure of the clypeus and head, &c. DIPHAULACOSOMA, n. gen. (Halticinee). Body ovate ; palpi thickened ; antennae robust and short, the terminal four joints dilated and compressed; thorax transverse, without depressions, the sides strongly dilated and widened at the middle, constricted at the base; scutellum subquadrate, its apex truncate ; elytra narrowed and subacute at the apex, obsoletely punctured, their epipleurae extending below the middle ; femora robust, the posterior ones thickened ; the tibiae not channelled, the posterior ones with a spine ; the first joint of the posterior tarsi as long as the following two joints together ; claws appendiculate ; prosternum narrow, convex; the anterior coxal cavities opeu. The genus here proposed is principally distinguished by the dilated terminal joints of the antennae and by the peculiar shape of the thorax, which is strongly widened and rounded at the middle, in connection with the open cavities. Sphcerophysa, Baly, also inhabiting Madagascar, has the antennae likewise dilated ; but this dilatation is not confined to the terminal joints ; the body in Sphcerophysa is also strongly rounded, not ovate, and the coxal cavities are closed. DIPHAULACOSOMA L^EVIPENNE, n. sp. (Plate XXXIX. fig. 8.) Entirely fulvous, shining; terminal four joints of the antennae black ; thorax impunctate; elytra wider than the thorax, entirely impunctate ; tarsi fuscous. Length 2\ lines. Head impunctate ; the frontal tubercles oblique, distinct, bounded behind by a transverse groove ; the clypeus with a short central ridge ; penultimate joint of the palpi thickened ; antennae only extending a little beyond the base of the elytra, fulvous, the terminal four joints black; thorax twice as broad as long, dilated at the sides, |