| OCR Text |
Show 1902.] OF AMERICAN COLEOPTERA. 203 groove, the surface, like the head, rufous and impunctate; scutellum of the latter colour; elytra greenish-aeneous, with very closely approached and irregular rows of rather fine punctures, which are evenly distributed over the entire surface; below rufous, the abdomen paler, the tibiae and tarsi more or less black; the prosternum rather broad, elongate. Hab. Peru. I know only a single specimen of this large species, which seems allied to C. consularis Har. from Colombia, but differs in the colour of the underside, the different comparative length of the joints of the antennae, and the non-continued thoracic sulcus. NASIGONA, gen. n. Body elongate; antennae filiform; lower portion of the face concave, the clypeus not separated ; thorax transverse, the anterior angles oblique, the surface obsoletely sulcate near the base; elytra closely punctate-striate, their epipleurae broad, concave, the anterior and intermediate tibiae unarmed, posterior tibiae with a small spine, non-sulcate, the metatarsus of the posterior legs as long as the following joints together, claws appendiculate; prosternum narrowly elongate ; the anterior coxal cavities closed. The genus here proposed is allied to Oxygona, JSfasidia Har., and Systena, but differs from all of them in the structure of the head, which at its lower portion resembles that of some genera of Longicornia or of Loxoprosopus among the Halticidae; the structure of the antennae and the shape of the thorax differ likewise from Nasidia, and the punctate-striate elytra from Oxygona. From Systena the genus may be separated by the structure of the head and the very elongate joints of the antennae, as well as by the punctate-striate elytra. NASIGONA PALLIDA, sp. n. (Plate XX. fig. 12.) Entirely pale testaceous ; antennae black, the apical three joints testaceous, head and thorax impunctate; elytra strongly punctate-striate, the punctures nearly obsolete at the apex, a spot near the scutellum and another near the apex piceous. Var. Elytra without spots. Length 5 millim. Head entirely impunctate, testaceous, the frontal elevations raised anteriorly and divided by an elongate fovea; clypeus forming a single piece, perpendicular, with a feeble central and lateral ridge, the anterior edge likewise narrowly raised; labrum large, apex of the mandibles black; antennae slender, all the joints, with the exception of the second, very elongate, the basal one and the last three joints testaceous, the others black; thorax twice as broad as long, the sides distinctly constricted at the base, rounded anteriorly, the anterior angles oblique, the surface impunctate ; scutellum rather broad, impunctate; elytra wider at the base than the thorax, the base slightly raised, strongly punctured in closely approached rows, the interstices more or less distinctly 14* |
