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Show 1878.] MR. M. JACOBY ON PHYTOPHAGOUS COLEOPTERA. 993 margin anteriorly with another transverse band of a ^-shaped form, and placed in the middle of the elytra), as well as a short rounded band near the apex (this latter band being also connected with the former one by a short vitta near the lateral margin), shining metallic green; the inflexed margin of the elytra, as well as the underside and the legs, testaceous. Hab. Costa Rica ? Collection Jacoby. Allied to D. vittaticollis, Stal, but differing in the colour of the head, antennse, and palpi, and the longitudinal stripe between the second and third bands. 22. SCELIDA BALYI, Sp. nOV. Elongate, parallel, testaceous; vertex of head, last six joints of antenna?, and the coxa? black. Elytra metallic green, closely rugose-punctate. Length 4\ lines. Head impunctate, with two distinct tubercles between the antenna?, limited behind by a transverse groove, lower part of face with a raised triangular ridge ; last joint of maxillary palpi piceous ; vertex of head black, shining ; lower part and the basal five joints of the antennse flavous, the latter about three fourths the length of the body, with the three terminal joints slightly curved. Eyes prominent, black. Thorax subquadrate, widened from the apex towards the middle, from there straight to the base, the anterior and posterior margins slightly sinuate in middle; surface entirely impunctate, the disk depressed, flavous, with indistinct irregular blotches of a piceous colour. Scutellum semiovate, dark piceous, with a light-coloured margin. Elytra much wider at the base than the thorax, sides entirely parallel, the surface covered throughout with crowded and rather deep punctures, the intervals of which are finely rugose, of a metallic, moderately shining green colour, which assumes towards the apex and near the suture a purplish hue. Under surface and legs flavous, the base of the coxse and a spot at the base of the anterior femora piceous or black ; the metathorax on each side raised in the shape of a triangular-pointed elevation. This species is the second one belonging to this genus, the first of which was published in diagnosis by Mr. Chapuis in his eleventh volume ofthe'Genera of Coleoptera.' From this species it is sufficiently distinguished by its smaller size, the black vertex of the head, together with the spots on the coxa? of the legs, aud by the peculiar shape of the metathorax. 23. DIABROTICA WATERHOUSEI, sp. nov. Elongate, convex, widened behind, flavous. Head, breast, and the extreme base of the elytra pitchy black, the apex of the latter brownish fuscous. Length 3 lines. Head shining black, with a distinct fovea between the eyes; antennse ferruginous, the basal joint flavous. Thorax quadrate, |