OCR Text |
Show 186 MR. MARTIN JACOBY ON NEW SPECIES [Mar. 4, I must separate this species from any other on account of the impunctate thorax, which even under the strongest lens shows no trace of any punctuation. Examples of both sexes are before me, and do not seem to vary except in the slightly broader thorax of the female. LACTINA SEMIRUGOSA, sp. n. Metallic green, glabrous above, below bluish; thorax sub-quadrate, finely punctured, the transverse sulcus deep; elytra widened below the middle, very closely and strongly punctured, the interstices more or less rugose. Length 7 millim. Head very finely transversely wrinkled, without punctures, the frontal elevations strongly raised, pyriform, carina acute; antennae long and slender, metallic blue at the four or five basal joints, the rest black, third and fourth joints equal, shorter than the fifth ; thorax about one-half broader than long, the sides nearly straight, very slightly narrowed anteriorly, the surface very finely but not very closely punctured, the basal sulcus deep and nearly straight, bounded laterally by a deep perpendicular groove ; scutellum blackish; elytra widened below the middle, without basal depression, comparatively strongly and very closely punctured, with finely wrinkled interstices ; below very sparingly pubescent. Hab. Colombia. I know of no other species of Lactina with such strongly punctured elytra in connection with the glabrous upper surface. The description is that of the male, in which the anterior tarsi are dilated, and the last abdominal segment has a central narrow groove ; the female does not differ except in the more slender tarsi and the generally rather larger size. LACTINA GLABRATA, sp. n. Metallic dark blue, glabrous above ; thorax one-half broader than long (o*), nearly impunctate, with deep sinuate sulcus; elytra very closely and distinctly punctured. Length 6 millim. Male. Head impunctate, the frontal tubercles strongly raised, oblique, the carina acute; the antennae nearly extending to the apex of the elytra, metallic blue, the third joint slightly longer than the fourth and as long as the fifth joint; thorax one-half broader than long, the sides straight at the base, slightly rounded anteriorly, the anterior angles thickened, the surface with a deep sinuate sulcus, the anterior portion rather convex, very minutely and somewhat closely punctured as well as the base below the sulcus; scutellum small, impunctate ; elytra convex, not widened posteriorly, attaining their greatest convexity at the middle, very closely and rather strongly punctured, the apex of each rounded, their epipleurae concave, impubescent; below and the legs smooth, shining ; the male organ curved, parallel, the apex rather blunt, with an elongate cavity. |