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Show 1 9 0 5 .] OP PHYTOPHAGOUS COLEOPTERA. 4 5 3 Head impunctate, frontal elevations broad, well marked, carina very convex and prominent, eyes very large ; thorax twice as broad as long, the sides broadly flattened, the lateral margins rather rounded near the base, gradually narrowed anteriorly, anterior angles produced into a small tooth, the surface impunctate, with a transverse depression at the sides near the base, testaceous, the sides with a trilobate black spot, the middle lobe pointed upwards; elytra nearly parallel, with a feeble depression below the base, impunctate, a round black spot on the shoulders, another near the scutellum, and a third spot of transverse shape at the middle, as well as the sutural margins from below the base to the apex, black ; under side and legs testaceous. Hab. Peru. I know only a single specimen of this species and am not aware therefore if the markings of the elytra are subject to variation, which is probably the case. The species has the frontal carina, however, much more strongly raised than most of its allies, the elytral spots are comparatively large and deep black ; this and the similarly coloured suture will assist in the recognition of the species. Oe d io n y ch is b a s in o t a t a , sp. n. (Plate XV. fig. 4 .) Piceous, the base of the head and a transverse band at the thorax bluish-black; elytra strongly and closely punctured, with four black spots, placed obliquely at the base in a semicrescent. Length 6 millim. Head strongly punctured near the eyes, fulvous, the vertex bluish-black, frontal elevations robust, oblique, carina short and broad ; eyes large, each as broad as the dividing space; antennae scarcely extending to the middle of the elytra, black, the lower three joints more or less flavous below, third joint thinner but as long as the fourth ; thorax twice as broad as long, the lateral margins straight at the base, rounded anteriorly, the anterior angles produced into a strong tooth, the sides deeply sulcate and flattened, surface with a few minute punctures, the entire disc bluish-black, the margins fulvous ; scutellum black; elytra not depressed below the base and scarcely so within the shoulders, closely and strongly punctured, each with two bluish-black spots at the base placed transversely, the outer one transverse, the inner of more elongate shape ; below and the legs nearly black ; metasternum raised anteriorly. Hab. Paraguay. This beetle differs in the markings of the elytra from any other described species. O e d io n y ch is m a c u l a t is s im a , sp. n . Ovate, convex, dark fulvous below, vertex of head piceous; antenna? and thorax fulvous, the latter with two transverse, black spots; elytra rather strongly punctured, pale fulvous, with ten spots each (3.3.2.2). |