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Show 1 9 0 5 .] OF PHYTOPHAGOUS COLEOPTERA. 4 5 5 rather flattened, evenly, closely, and strongly punctured, the basal margin very narrowly and five spots on each elytron black: of these, one of transverse shape is placed before the middle, two obliquely below the middle, and two others near the apical margin ; breast and abdomen black, the last segment and the legs testaceous' the posterior femora with a black spot at the apex. IIah. Brazil. Allied to 0. nigromaculata Sturm, but differing in the black basal elytral margin and the different position of the spots, also in the colour of the antennae. O e d io n y ch is p e r s im il is , sp. n. Elongate, testaceous; thorax impunctate, the anterior angles mucronate ; scutellum black; elytra not perceptibly punctured, with five black small spots on each (1.2.1.1). Length 6 millim. Head impunctate, the eyes rather widely separated, frontal tubercles broadly subquadrate, carina short and rather blunt ; antennae scarcely reaching to the middle of the elytra, testaceous, the third and following joints nearly equal; thorax more than twice as broad as long, the sides rounded, the anterior angles slightly produced outwards into a small tooth, the lateral sulci deep, the surface impunctate, obsoletely depressed in front of the scutellum, the latter black ; elytra obscure testaceous, each with five small black spots, of which one is placed on the shoulders, two before the middle obliquely, the inner one near the suture, the fourth spot below the middle near the lateral margin, and the fifth below the sutural spot at some distance from the apex; under side and legs testaceous, the posterior femora with a black spot at the upper edge. Hah. Cliilpancingo, Mexico. Of more elongate shape than 0. 13-maculata, and with five spots on each elytron, the spots small and placed rather differently. Both specimens before me are of a very dull obscure testaceous colour in regard to the elytra, but this may be due to discoloration. 0. atroguttata J ac., from the same locality, is a closely allied species, but it differs in the shape of the thorax, as well as in the position of the elytral basal spots and their number. O e d io n y ch is su b d il a t a t a , sp. n. Ovate, medially widened, black; head and antenme piceous; thorax pale testaceous or whitish, narrowed anteriorly, impunctate; elytra broadly margined, impunctate, testaceous, an obscure transverse band at the base, with two black spots and another below the middle with another larger spot, obscure fulvous. Length 6-7 millim. Head impunctate, the vertex black or piceous, frontal elevations narrowly transverse, eyes rather large ; antennae piceous or dark fulvous, the third and fourth joints equal; thorax with distinctly rounded sides, gradually narrowed anteriorly, the angles rather P roc. Z ool. S oc.-1905, Y o l . II. No. XXXI. 31 |