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Show 784 MR. M. JACOBY ON N E W [Dec 16, Head with the usual transverse depression, light brown, deeply punctate at the base, leaving, however, a space in the middle of the vertex smooth ; anterior part testaceous ; maxillary palpi filiform ; antennse reaching to about one third of the length of the elytra, the first joint much thickened, as long as the third, the second short, rounded, joints sixth to ninth thickened and widened, the rest a little more elongate, closely pubescent. Thorax about twice as broad as long; the anterior angles pointed and slightly produced outwards ; sides sinuate near the base, but not angulate ; surface with a shallow depression on each side, and a short, raised, longitudinal, smooth space in the middle, not touching either the anterior or posterior margin ; the disk covered with punctures as deep as those of the head, more curved near the base and sides than at the anterior portion, and covered sparingly with golden-yellow hair ; an obscure spot of fuscous is visible at each side and on the disk. Elytra much wider than the thorax, convex and subcylindrical, finely punctate striate, more obsolete near the apex, covered also sparingly with silky yellow pubescence; they are slightly depressed before the middle, of a dark chestnut colour, rather shining, and have each an obscure, round black spot placed in the hollow of the depression. Underside and legs lighter- coloured, the posterior thigh with a rather large black patch on the outside; posterior tibiae near the apex with comb-like teeth and one spur ; claws appendiculate. Hab. Amazons. The dilated antennse, antemcdian depression of the elytra, together with the spur at the posterior tibiae, show this species to belong to Clark's genus Homammatus, although it might perhaps have been placed, with equal right, amongst the genus Homotyphus or allied genera. Von Harold, in the ' Coleopt. Hefte,' has already pointed out the artificial construction of many of Clark's genera, founded very often on doubtful and variable structures of different organs; and it is very possible that the student may often be puzzled as to the genus to which an insect of this family belongs. 22. ALLOCHROMA BIMACULATA, sp. nov. Oblong, ovate, robust. Light fulvous, glabrous ; antennae, the four anterior legs, and a spot on each elytron before the middle black. Length 3 lines. Head with a few fine punctures, a round fovea in the middle of the vertex, and a transverse groove between the eyes; another deep longitudinal fovea is situated between the antennae ; the latter are short and robust, entirely black, the first joint is claviform, the second short and rounded, the third nearly as long as the first, the fourth and fifth joints shorter and of equal length, the sixth joint dilated and much more robust than the others, the rest rather short and slightly widened ; maxillary palpi robust, the penultimate joint transverse, the last joint conical and pointed. Thorax transverse, all the angles acute and rather produced, the sides distinctly angulated before the middle, thence to the base concave, not straight ; surface rather convex, with two shallow foveae at each side near |