OCR Text |
Show 988 MR. M. JACOBY ON PHYTOPHAGOUS COLEOPTERA. [Dec. 3, striate, purplish blue, a large triangular sutural patch from the to the middle reddish copper-coloured. Length 4\ lines. Head and clypeus deeply punctured, with a deep longitudinal groove in the middle, of a greenish semiopaque colour, here and there with a purplish tint ; labrum and jaws nearly black ; first joint of the antenna? very thick and subcylindrical, the second short and globose, the rest cylindrical, equal in length ; the first six joints shining greenish aureous, the rest black, opaque. Thorax subquadrate, slightly broader than long, all the angles acute and produced externally, the sides with a distinct tooth behind and another very obsolete one before the middle ; disk irregularly transversely wrinkled, visible only when viewed sideways, and covered with large and small punctures; of a greenish colour, sometimes with purplish patches. Scutellum elongate, finely punctate. Elytra much wider at the base than the thorax, a little widened posteriorly ; each elytron with eight longitudinal costa?, the intervals subgeminate-punctate-striate; bluish purple, a large sutural triangular patch, extending from the base to below the middle, of a reddish copper, surrounded by light green colour. Underside and legs dark green, with a purplish hue. Hab. Columbia. Two specimens in m y collection. 12. CHALCOPHANA SEMIRUFA, sp. nov. Elongate, subparallel, piceous below. Head, thorax, first six joints of the antenna?, and the legs rufous. Elytra deeply and closely punctate-striate and partly costate, shining bronze-colour, extreme margin and the apex rufous. Length 3| lines. Head deeply punctured, with a median groove, labrum yellowish, apex of mandibles black ; antenna? with the first six joints rufous, the rest black. Thorax transverse, the posterior margin round and widened in the middle, the anterior one straight, all the angles produced into a short acute tooth, the surface rather coarsely punctate towards the sides, less so on the disk. Scutellum rufous. Elytra with a more or less distinct oblique depression below the base, closely punctate-striate, the punctures not united in pairs, and regularly placed only towards the suture, the rest confused and irregular; the apex as well as the sides of each elytron furnished with three or four more or less distinct costa?, those at the sides commencing below the humeral callus ; the surface of a bronze or metallic green colour, the extreme lateral margins and the apex rufous. Underside dark piceous, as well as the tarsi. Hab. Costa Rica. Of the six or seven similarly-coloured described species, the present one will be easily recognized by the colour of the first six joints of the antenna?, which is constant in all the specimens before me, as well as by the strong punctuation of the thorax and the elytra. |