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Show 148 MR. M. JACOBY ON PHYTOPHAGOUS COLEOPTERA. [Feb. 5, this, and two transverse markings at the apex, and placed laterally, is a distinct ^-shaped spot placed directly below the middle of each elytron. Legs and apex of abdomen ferrugineous. Length 4\ lines. Hab. Costa Rica. Collection Jacoby. The absence of all smaller spots usually found in the species of this genus, and the peculiar pattern of the elytral markings, as well as the purplish hue of the latter, will distinguish this species from others. Family GALLERUCID^E. Genus D I A B R O T I C A , Chevrol. 10. D I A B R O T I C A S E X P U N C T A T A , sp. nov. Elongate, subparallel, above dark brick-red, each elytron with three black spots ; head flavous, front impressed with a short longitudinal groove, which terminates in a deep fovea, between the eyes, vertex very minutely punctured ; antennae more than half the length of the body, very light testaceous; thorax subquadrate, the lateral margins bulging out slightly before the middle, with all the angles obtuse, surface impunctate, but little convex, of a flavous colour, stained with darker irregular patches ; scutellum smooth, triangular: elytra wider at the base than the thorax, and increasing in width towards the apex, distinctly margined at the sides, and closely punctate, the interstices here and there subrugose; they are of a brick-red colour, with a small round spot on the shoulder, another below the base near the sutural margin, and a third behind the middle black. Underside blackish, finely yellowish-pubescent; tibiae testaceous ; claws darker. Length 5 lines. Hab. Volcano of Irazu, Costa Rica. This insect closely resembles in colouring the D. tripunctata of Oliv., but differs in the want of the impression on the thorax, besides the different shape of the elytral spots. 11. DIABROTICA VENTRICOSA, sp. nov. Elongate-ovate, very convex and widened posteriorly, black; head and thorax ferrugineous ; elytra with two basal spots, a transverse band in middle and another at the extreme apex flavous ; head finely pnnctate, with two crescent-shaped elevations between the antennae; the latter very light testaceous, with the apical joints a little darker; thorax subquad rate, very convex, the posterior margin sinuate in middle, and the sides very deflexed near the posterior angles, disk obliquely foveolate on each side, finely punctured everywhere; scutellum transversely impressed near the base, black ; elytra very swollen posteriorly, and much widened from before the middle, distinctly punctured, the punctuation partly arranged in striae, especially so towards the apex, shining black; a large round spot near the scutellum, another small one directly below the humeral callus, a |