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Althonarosa Kawada

Type species: horisyaensis Kawada (probably a senior synonym of nigricristata Hering).

This genus has facies reminiscent of Altha species; the ground colour is white and there are shadings of greyish brown, usually an obtusely angled postmedial across the apex of the forewing, an oblique medial posterior to the black discal dot and a shade over the dorsal third of the hindwing. The venation is as in Narosa with forewing vein R1 sinuous; the antennae are not filiform as in that genus but narrowly bipectinate over the basal half, the pectinations tapering away smoothly distally.

The male genitalia offer no strongly diagnostic features, though there is a setose lobe on the valve subcostally, subbasally. In the female genitalia (horisyaensis examined only) the ovipositor lobes are relatively narrow, the ductus bursae is sclerotised basal to the ductus seminalis and finely scobinate just distal to it until it broadens out into the bursa. The bursa has a small, circular, coarsely scobinate signum just subapically, with a group of three similar coarse spines to one side.

A. horisyaensis is known from Taiwan, China, Peninsular Malaysia, Java and Bali, defined by the presence of two slender spines at the aedeagus apex. The juxta is a deep plate, dorsally bilobed. There are two species in Borneo, one of which is also found in Peninsular Malaysia.

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