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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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