OCR Text |
Show 1905.] OF PHYTOPHAGOUS COLEOPTERA. 439 0 . cardinalis in tlie coloration of the head and the antennae, in the scarcely rounded sides of the thorax, and in the shape of the posterior elytral band. The same differences separate the species from others nearly similarly marked. This is one of the most difficult sections of the genus, as the amount of variation in regard to the elytral bands, their shape and size, can only be ascertained where sufficient material is at hand ; neither coloration nor sculpture can always be relied upon in these insects. O e d io n y ch is a r c u a t a , sp. n. Black, the head bluish; clypeus flavous; thorax impunctate, flavous ; elytra closely and distinctly punctured, flavous, a broad transverse band at the base, a transverse large spot below the middle, and the apex metallic blue. Length 6 millim. Head bluish black, strongly punctured at the sides above the eyes, frontal elevations broadly transverse ; clypeus flavous; antennae black, third joint scarcely shorter than the fourth, terminal joints rather robust and short; thorax more than twice as broad as long, the sides with a deep but not very broad sulcus, anterior angles strongly thickened but scarcely produced, the lateral margins rounded anteriorly, straight at the base, the disc very finely punctured when seen under a strong lens, flavous, the base with a very obsolete transverse sulcus; scutellum black; elytra with very narrow reflexed lateral margins, not depressed below the base, very closely and more or less strongly punctured, the anterior half of their length occupied by a transverse blue band not extending to the lateral margins, its posterior edge concave, immediately below the middle is another large transverse band which has its anterior margin convex and the posterior one rounded, the extreme apex of each elytron is likewise metallic blue ; under side and legs black. IIab. Colombia. Evidently closely allied to 0. labiatci Schauf., but the fourth joint of the antenrne in that species is described as the longest; the elytra are described as nearly smooth, and the first transverse band as being interrupted at the suture; the same is the case with the second band, which is said to be composed of two spots. O ed io n y ch is b ip a r t it a , sp. n. Broadly ovate, convex, black, the clypeus and the thorax fulvous, the latter very minutely punctured, the angles mucro nate ; elytra extremely closely and finely punctured, flavous, a transverse band at the base, another one at the middle, and a third near the apex, bright metallic green. Length 7-8 millim. Head black, impunctate, diameter of each eye about as wide as the dividing space, clypeus fulvous, frontal elevations narrowly P roc. Z ool. S oc.-1905, V o l . II. No. XXX. 30 |