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Show MR. MARTIN JACOBY ON NEW SPECIES [Nov. 28, joints more or less flavous below, the third joint distinctly shorter than the fourth; thorax with the sides broadly flattened, the anterior angles pointed but not produced, the disc impunctate, testaceous, the lateral margins feebly rounded anteriorly; scutellum black; elytra convex, without basal depressions, with narrow reflexed margins, closely and very finely punctured, testaceous; under side and legs black, the abdomen more or less flavous at each side. IIab. Peru. Very closely allied to 0. plebeja Klug, but in that species the head is punctured at the vertex and the eyes are margined with testaceous, the elytra are more strongly punctured, and the " habitat " of the species is Brazil. I have preserved Clark's catalogue name for the present species, of which specimens are also contained in the British Museum. 0. obscuripennis Jac., also from Peru, is likewise very closely allied, but is a smaller insect, of different shape, with the anterior angles of the thorax mucro-nate and a much more flattened carina of the clypeus. O e d io n y ch is n ig r im a n a , sp. n. Black; thorax short and strongly transverse, impunctate; elytra finely punctured, pale greyish-testaceous. Length 5 millim. Of medially gradually widened shape, moderately convex ; the head entirely impunctate, black, the frontal elevations transverse, contiguous, carina acute, convex; antennae black, the third and fourth joints equal (the rest wanting); thorax short, of equal width, more than twice as broad as long, the lateral margins rounded, the sides broadly flattened, the anterior angles neither thickened nor produced, the surface impunctate, black, very shining ; scutellum black ; elytra gradually widened towards the middle, finely and closely punctured, pale greyish-testaceous, below and the legs black ; metatarsus moderately short, claw-joint very strongly inflated ; prosternum proportionately broad. I fab. Peru. Of similar coloration to 0. turpis Jac., but much smaller, the head and thorax entirely black and the elytra without apical black spot. O e d io n y ch is a l b ip e n n is Jac. Since this species was described (P. Z. S. 1894, p. 609) I have received a good many more specimens from the Amazon regions, which prove that the insect is extremely variable in regard to size as well as to coloration. The type was described from nearly unicolorous specimens ; those nowT before me show the following elytral markings:- a. Two spots at the basal margin; a longitudinal streak near the side, very broad at its commencement, strongly pointed at the apex. |