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Show !°/9.J PHYTOPHAGOUS COLEOPTERA. 789 black, shining, Scutellum black, trigonate. Elytra dilated posteriorly, with a shallow depression below the basilar space, and several others near the lateral margins ; another longitudinal sulcation runs parallel with the latter, but finishes at some distance before the apex ; surface minutely and closely punctate, dark violaceous blue. Underside and legs black ; abdomen flavous. I unfortunately possess only one specimen, and that a female, of this distinctly-coloured species; the antennse in the male will probably show the same dilatation as in the other species belonging to this genus. Genus N E S T I N U S , Clark. 31. N E S T I N U S F L A V O - M A R G I N A T U S , sp. nov. Elongate, parallel, rugose-punctate; finely pubescent. Flavous; base of the head, three transversely-placed spots on the thorax, antennae, tibiae, and tarsi black ; elytra metallic cupreous, the margin flavous. Length 5-5i lines. Hab. Mexico. Head rugose-punctate, with a fine longitudinal median groove at the vertex extending to the clypeus, flavous, with an elongate black spot from the middle of the base to almost the anterior margin of the eyes ; apex of labrum and the palpi black ; antennae about half the length of the body, black, basal joint thickened, robust, second short, third of double the length, fourth joint longer than the third and the longest. Thorax transverse, sides nearly parallel, all the angles slightly thickened, the posterior ones oblique; surface obliquely depressed at each side, longitudinally grooved in the middle, irregularly rugose-punctate, flavous, a spot at each side near the lateral margin, and another in the middle, a little distance from the base, black. Scutellum black, finely punctate and pubescent. Elytra closely rugose-punctate, finely flavous-pubescent near the margin, metallic cupreous, the lateral margins and apex flavous. Tibiae and tarsi black. Claws bifid. The flavous margination of the elytra will distinguish this species from those described by Clark. Genus DIABROTICA. 32. D I A B R O T I C A M A R G I N E L L A , sp. nov. Subelongate, widened behind. Flavous; antennae (joints seventh and eighth excepted), base of head, and two spots on the thorax greenish black. Elytra strongly punctate, broadly margined, metallic green, lateral and sutural margins, as well as the apex, flavous. Upper surface of femora and the tibiae and tarsi black. Length 3-4^ lines. Hab. Costa Rica. Head longer than broad, swollen, impunctate, front impressed with a small fovea; encarpae obsolete; carina not visible ; lower part of face flavous, labrum and vertex blackish green; antennae two thirds the length of the body, filiform, the second joint short, the rest of |