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Show 166 MR. M. JACOBY ON NEW [Mar. 2, 6. Descriptions of new Species of Phytophagous Coleoptera. By MARTIN JACOBY. [Received February 18, 1880.] (Plate XVIII.) Genus MASTOSTETHUS, Lac. 1 MASTOSTETHUS CHONTALENSIS, sp. nov. Oblong parallel. Testaceous ; base of head a transverse fascia on the thoSx! and two transverse bands on the elytra, one a the base, the'other behind the middle, black ; sides of the breast, a streak at the upperside of the femora, and the tibiae black. Length 4\ lines. Hab. Chontales, Nicaragua. , -» Base of head closely punctured near the eyes; lower part of face testaceous, very shining, deeply transversely grooved; apex of jaws black 'Ztemi light testaceous, the first three joints black closely pubescent. Thorax transverse, subquadrate, angles ******* slightly contracted near the base and apex; surface widely, but distinctly punctured, the entire disk occupied by a transverse black band of rather irregular shape, thickened at each end. Scutellum black, distinctly punctured. Elytra irregularly and deeply Punctured; the base is occupied by a rather large black transverse band which does not quite touch the lateral margins, and is narrowed to wards the scutellum; while another broader band is placed behind the middle, the anterior margin of which is slightly sinuate. Unckrside testaceous ; sides of breast, upper surface of the femora, and the * This species is closely allied to M. vicinus, Lac. but differs several particulars as regards coloration, the principal difference consisting in the want of the black extremity of the elytra. Collected by Mr. Belt. In the collection of Messrs. Godman and Salvin. 2. MASTOSTETHUS ROGERSI, sp. nov. Oblong. Dark rufous ; antennae black ; elytra testaceous, closely punctured, a spot at the base and a broad band behind the middle black. Length 4 lines. Hab. Cache, Costa Rica. Head with some spots on the vertex, closely punctured round the eyes with a short longitudinal fovea in the middle, entirely dark rufous; antennae black, the first four joints shining, the rest closely pubescent. Thorax wider at the base than the apex; the angles rather blunt; surface with a few distinct punctures. Scutellum rufous, its apex black. Elytra wider at the base than the thorax, deeply and irregularly punctured, testaceous; the base ot |