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Show 348 MR. M. JAC0BY ON THE [Mar. 7, surface depressed at the middle ; elytra slightly wider at the base than the thorax, rather flattened, the apex of each rounded: underside black, more shining: legs fulvous, all the tibias mucronate, tbe first joint of the posterior tarsi longer than the following joints together ; prosternum extremely narrow, the anterior coxal cavities open ; posterior femora thickened; tbe last abdominal segment of the male deeply depressed; anterior coxas very prominent. Hab. South Africa (my collection). The type of this genus was described by Weise from China, and the present African species almost entirely resembles it, except in the colour of the legs and its larger size, but I cannot find any structural differences sufficient to warrant its separation. The genus seems to represent a transitionary form between the Halticince and Galerucince, since the whole general shape and the almost indistinct pro?ternum resemble much more a species of the latter family; but the distinctly dilated posterior femora leave no doubt as to the real place of the insect. JAMESONIA Jac. This genus, originally described by me under tbe name of Gabonia, but subsequently altered to Jamesonia, seems to me to be identical with Weise's genus Thrymnes (Deutsche entom. Zeitsch. 1895). A renewed examination of other specimens since received has proved to m e that I have wrongly given the anterior coxal cavities as closed: the opposite is the case, they are open. The" name of J. unicostata seems also applicable only to the female sex of that species, as I have received lately a male specimen from Dr. Kraatz, obtained at the Cameroons, in which the elytra are without the transverse ridge near the apex : this specimen agrees, however, in everything else with the female types, except in haAing the entire head flavous. The species is evidently identical with Thrymnes nucleus Weise. JAMESONIA WEISEI, sp. n. Flavous, the apical joints of the antennas and the posterior legs black ; head impunctate, thorax with a few fine punctures; elytra scarcely more strongly punctured; tarsi fuscous. Length 3 millim. Head impunctate, the eyes large, the frontal elevations and the carina distinctly raised, labrum and mandibles piceous; antennas black, the lower three or four joints flavous, the second and third joints small, equal, the fourth but slightly longer, the others more elongate ; thorax nearly twice as broad as long, the sides slightly rounded, the angles not produced, the posterior ones slightly oblique, the surface nearly impunctate, shining, flavous ; scutellum flavous, broader than long; elytra wider than tbe thorax at the base, slightly widened towards the middle, scarcely perceptibly punctured, when seen under a strong lens; below flavous, the posterior legs piceous or black, tarsi more or less dark coloured. |