OCR Text |
Show 994 MR. M. JACOBY ON PHYTOPHAGOUS COLEOPTERA. [Dec. 3, rather convex, smooth, narrowed towards the base, surface shining, flavous. Scutellum black. Elytra widened towards the apex, rather convex, light flavous, a narrow transverse band at the base undulated at its posterior edge, and extending to the humeral callus, dark fuscous or black; the posterior third of the elytra fuscous brown, surrounded by an indistinct crescent of a darker colour; the rest of the surface covered with minute piceous spots, visible only under a lens. Underside black ; abdomen brownish; legs flavous, the hinder tibiae on their outer side blackish. Var. Thorax at the anterior margin with a triangular black spot; the apical markings of the elytra obsolete. Hab. Cache, Costa Rica. Collected by Mr. Rogers. 24. DIABROTICA JANSONI, sp. nov. Elongate, convex, widened behind, fulvous. Thorax and elytra closely punctate, a large oval patch near the apex of the latter violaceous blue. Length 4^-5 lines. Head with a deep transverse groove, closely punctured, fulvous ; antenna? robust, as long as half the length of the body, fuscous, the first joint below fulvous, the fourth joint nearly double the length of the third. Thorax transverse, sides nearly parallel, with three indistinct shallow depressions on the disk, of which two smaller ones are situated on each side and a large one near the posterior margin at its middle; surface distinctly but not very closely punctate, fulvous. Scutellum broad, triangular, its surface very finely alutaceous, and slightly excavated near the base. Elytra more than four times the length of the thorax, much widened towards the apex, and distinctly margined; the surface crowded everywhere with distinct punctures of the same colour as the head and thorax, the whole of the posterior third occupied by a large rounded spot of violaceous blue, which sometimes terminates at some distance from the apex. Underside and the femora testaceous; tibia? and tarsi fuscous. Hab. Chontales, Nicaragua. Collected by Mr. Janson. In m y collection. 25. DIABROTICA FUSCOMACULATA, sp. nov. Testaceous below. Head, thorax, and elytra olive-green, the latter obsoletely costulate, with the base and two spots on each elytron dark fuscous, margined with pale yellow. Length 24^ lines. Head impunctate, with a fovea in the middle, shining green; labrum dark brown; antenna? nearly reaching to the end of the body, with the second and third joint very short, the fourth three times as long as the second joint, of an indistinct brownish colour, the first joiut pale greenish. Thorax bifoveolate, impunctate, very shining olive-green. Scutellum flavous. Elytra subdepressed, |