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Show 4 0 0 MR. MARTIN JACOBY ON NEW SPECIES OP [Dec. 13, the following elongate; thorax twice as broad as long, the sides rounded with comparatively broadly reflexed margins, the basal sulcus rather deep, the surface impunctate, rufous; scutellum fulvous; elytra nearly parallel, not depressed below the base, the shoulders prominent, the surface finely and closely punctured, the punctures distinct to the apex ; underside and legs rufous, the tibiae at their outer edge and the tarsi black. Hcib. Prov. Huallaga, Rio Mixiollo, Peru (G. A. Baer). Collection M. Clavareau and my own. This species of Lactica is allied to L. dives Har.; but differs from it in the black tibife, the rufous coloration, and blue not violet elytra, and from the other species of the genus in the same differences of coloration and the impunctate head ; in one of the specimens the head has a distinct fovea at the middle of the vertex, which is wanting in the other or is scarcely indicated. L a ctica a r g en t in en s is, sp. n. Flavous, antennae and legs black ; head and thorax impunctate ; elytra dark violaceous, microscopically punctured. Length 5| millim. Of broad and nearly parallel shape, the head very broad and convex, without scarcely an indication of tubercles or carina ; the clypeus broad, convex, scarcely separated from the face; labrum and palpi black ; antennae robust, black, the second and third joints short, nearly equal, fourth and following joints about one half longer; thorax twice as broad as long, narrowed anteriorly, the anterior angles oblique, the basal sulcus deep as well as the perpendicular lateral grooves, the surface impunctate, pale flavous ; scutellum triangular, flavous; elytra convex, without trace of a basal depression, dark violaceous blue, remotely and extremely minutely punctured ; underside flavous, legs black. Hob. Tucuman, Argentine Rep. This is a well distinguished species on account of the broad and convex shape of the head, which nearly forms an uninterrupted smooth surface. I received two specimens of this insect from Mr. C. Bruch, of the La Plata Museum. A g a sic le s, gen. nov. Body elongate and glabrous ; antennae filiform, the third and following joints elongate, terminal ones shorter ; thorax as long as broad, the sides straight, the surface without sulcus ; elytra wider at the base than the thorax, obsoletely punctured, their epipleurae broad ; legs stout, the posterior femora strongly incrassate, their tibiae maicronate, the other tibiae unarmed, the first joint of the posterior tarsi as long as the following joints together, claws appendiculate ; prosternum narrow; mesosternum elongate, rather broad, deeply triangularly emarginate at the base ; anterior coxal cavities open ; pygidium not covered by the elytra, convex, broadly rounded. |
