Abstract
The species of the genus Arcastes Baly, 1865 from Oriental Region are revised. The type species is A. biplagiata Baly, 1865 by original designation. The genus Arcastes was erected by Baly based on a peculiar shape of the antennae. Subsequently, eight other species have been described in this genus. Up to now this genus was not revised, in particular the male and female genitalia have not yet been studied. Studies of the type material revealed, that A. biplagiata possess a very peculiar shape of median lobe and endophallic structures. Next to the genotype, only two valid species remain in this genus: Arcastes suturalis Jacoby, 1884 (with A. ismaili Mohamedsaid, 2000 as new synonym), and Arcastes dimidiata Laboissiere, 1929. Arcastes sumatrensis Jacoby, 1884 is a new junior synonym of Neolepta biplagiata Jacoby, 1884. All other species need to be transferred to other genera that will be subject of the ongoing revision of the Oriental Galerucinae. Distribution of the three species of Arcastes is restricted to Singapore, Malaysia, and Indonesia, southward to Java. In this paper we provide redescriptions of the genus and the valid species, including illustrations of external and genitalic characters, photographs of the primary type specimens, distribution maps and a key.
Highlights
The genus Arcastes was established by Baly in 1865 when he described Arcastes biplagiata Baly, 1865, which he originally designated as the genotype
All other species need to be transferred to other genera that will be subject on the ongoing revision of Oriental Galerucinae
(Figs 9, 15, 21) as in Arcastes are a unique pattern in oriental galerucines with elongated basi-metatarsus, while the median lobe in Neolepta, as in Monolepta, and Candezea, is narrower and has symmetrically arranged endophallic spiculae which are much smaller
Summary
The genus Arcastes was established by Baly in 1865 when he described Arcastes biplagiata Baly, 1865, which he originally designated as the genotype. Wilcox (1973) placed it in the section “Monoleptites” due to the strongly elongated basi-metatarsus. BMNH IRSN UKM NNML MCZH MNHU NHRS CJB Total Beetles of the genus Arcastes are medium sized Galerucinae with strongly elongated basi-metatarsus, without pronotal impressions, reddish head and pronotum and usually contrasting black antennae, legs and elytra, the latter often with yellowish to red spots, suture or base.
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