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Celaenaclystis Gen. n.

Type species: celaenacris Prout.

The type species of this new genus has strikingly modified male genitalia without any features that might enable the species to be assigned to any of the named segregates of Chloroclystis auctorum.

The facies is distinctive, similar in some ways to Pasiphila subgenus Gymnodisca, including the lack of correspondence between the pattern on the hindwing and forewing, that of the former being weak, obscure. The forewing is basically grey and black but with more ochreous ante- and postmedial fasciae, the latter with a central angle or flexure, beyond which is a paler patch of grey within the marginal band. The male hindwings are much more roughly scaled on the underside than those of the female, and the abdomen is densely invested with black scales, particularly towards the apex. The apodemes of the second tergite are rather broad, but short.

In the male abdomen the eighth segment is distinctly broadened, with robust, rather incurved octavals and short corematous structures laterally. The genitalia are similarly broad, the uncus present but short, the labides massive with a broad, punctuate bursa. The valves are robust, tapering, swollen in the saccular area, spined at the centre of the ventral margin and inwardly densely setose distally. The saccus is broad, square, with carinate lobes laterally. The aedeagus is short, with a robust, flexed cornutus.

In contrast the female genitalia are slight. The bursa is small, ovate, spined more or less throughout, the spines relatively small. The ductus seminalis arises from the more constricted basal part of the corpus.

The genus contains two species that are endemic to Borneo and an undescribed species in Seram (slide 19063).

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