Кавказский энтомологический бюллетень (Sep 2022)
On leaf-beetles of the genus Palpoxena Baly, 1861 (Coleoptera: Chrysomelidae) from Malaysia and Indonesia
Abstract
Four new species of the genus Palpoxena Baly, 1861 are described from Malaysia and Indonesia. Palpoxena achehensis sp. n. belongs to the P. bipartita (Jacoby, 1879) species group from Sumatra. This species has red elytra with the basal part black, the maxillary palpomere III is swollen, not flattened, eyes large, the antennomere III is strongly modified hook-shaped; the space between antennal sockets is flattened; the clypeus is with deep and wide excavation almost reaching eyes, the narrow space between them with the tubercle bearing the tuft of bristles on each side; antennae are slender, extended beyond apex of elytra; antennomere III is slightly flattened, antennomeres IV–V are cylindrical. Palpoxena sp. and Palpoxena klimenkoi sp. n. belong to the P. laeta Baly, 1861 species group from Peninsular Malaysia, Sumatra and Borneo. Palpoxena sp. from Sumatra, having the strongly enlarged and swollen protarsomere I, is most similar to Palpoxena shayakhmetovai Kizub, 2016 from Peninsular Malaysia and is possibly a Sumatran subspecies of the latter taxon. Although there are slight differences between them in the body colouration, the shape of the aedeagus and in the length/width ratio of the protarsomere I; it is not described as a new to sciences in this paper. Palpoxena klimenkoi sp. n. differs from other members of the species group by the following combination of characters: elytra dark bluish with narrow basal area; epipleura have very narrow sutural margin and wide apical area brown; antennomeres III–VIII are thickened, about 1.4–1.5 times wider than antennomere II, covered with not dense, short and adpressed setae on the ventral surface; the maxillary palpomere III is half-ellipsoid, with the slightly elongated and sharpened apical margin. Palpoxena parasabahensis sp. n. belongs to the P. variabilis (Jacoby, 1886) species group from Borneo. This new species differs from other members of the group by elytra green with reddish brown apex and entirely brown legs. In addition, only this species has the apex of the antennomere I with the protruding outer corner and the labrum with two long structures on inner side. Palpoxena trusmadiensis sp. n. has elytra green-blue or blue and tibiae darkened. This species differs from all congeners by the shape of the maxillary palpomere III which is slightly enlarged and flattened, but just a little wider than the palpomere II. Figures of the general view and the aedeagus are given for mentioned above and related species. A new key for males of the genus Palpoxena from Malaysia and Indonesia is proposed.
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