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Bornealcis Gen. n.

Type species: expleta Prout.

The three species in this genus are of delicate build, with very similar facies to several Alcis species in the brown forewings with angled or sinuous fasciae and reddish or yellowish orange hindwings. But species such as A. semiclarata Walker (Himalaya), A. cockaynei Prout and A. hemiphanes Prout (Java), and A. subtincta Warren and A. semiochrea Prout (Luzon) have male genitalia typical of Alcis, close to those of the A. variegata Moore group that includes the Bornean A. praevariegata .

The male antennae have the pectinations apical to each segment as in Alcis, and there is a setal comb on the third sternite.

In the male genitalia the juxta is as in Rikiosatoa, with a pair of very long filaments arising from a pouch between the bases of the valves, asymmetric with a pair of more robust spines, also asymmetric, in the type species. Uncus and gnathus are long, slender, the former not hooked; socii are present, most strongly in the type species. The valve is slender with a cucullus, but lacking other processes except in B. versicolor Prout comb. n. where there is a small lobe subbasally, centrally. The aedeagus is rather slender, the distal opening distinctively oblique. The vesica is small, corrugate scobinate with a dense mass of fine spicules.

In the female genitalia the ovipositor lobes are narrower, acute. The lamella postvaginalis is transversely pleated. The ductus is short, it and the base of the bursa sclerotised and scobinate or pitted. The bursa is narrow, elongate, ringed distally with two bands of widely spaced coarse teeth in the type species but immaculate in B. versicolor.

The genus is a member of the Alcis, Rikiosatoa and Pseuderannis Inoue group of Sato (1984a) but combines the juxta characteristic of the second without its diagnostic antennal feature. The extreme reduction of valve processes, the slender, sclerotised uncus and gnathus, the modified aedeagus and the ornamentation of sterigma and ductus appear to be diagnostic.

The three species are all endemic to Borneo and montane.

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