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Sypnoides infernalis Berio
Sypnoides infernalis Berio in Berio & Fletcher, 1958: 356.
Sypnoides gluta Swinhoe sensu Kobes, 1976: 31.

Sypnoides infernalis Sypnoides infernalis Sypnoides infernalis

. This and the next species are very similar to each other and to congeners, having a rich, dark brown ground to the forewing, variably crossed by a straight double postmedial and an obtusely angled (or curved concavely distad) double antemedial that together define a narrow medial band. These fasciae are paler than the ground but may be obscure. Between them is some further pale lineation and a discal spot. The fasciation tends to be yellowish white in infernalis and bluish white in the next species. The medial area can also be suffused with the same shade. Identification can only be made with confidence from the male genitalia. Both these species have the uncus flanked by spoon-like structures from the tegumen, as in S. gluta Swinhoe (Sumatra), but these are larger in the next species and with more spines around the scoop of the spoon. The tegumen is broader in infernalis. The valves are more acute and with more intricate ornamentation with flanges.

Taxonomic note. Berio described two aberrations of the species: ab. macrophthalma Berio, with the forewing uniform brown; ab. paralba Berio, with the medial area whitened apart from triangles at the costa and dorsum. No clear examples of the latter have been located, but a form of the next species probably parallels it. Both this and the next species are closely allied to S. gluta Swinhoe, described from Sumatra but noted also from Borneo by Berio & Fletcher (1958); Bornean material associated with gluta in BMNH is probably of infernalis and the next species, so this record needs confirmation. Eleven dissections across the range of variation of both failed to reveal any gluta, but gluta does occur in Peninsular Malaysia (slide 19106). The record of females of infernalis from Java by Berio & Fletcher (1958) is not included in the range below, given the difficulty of identifying males in this complex, and the relatively greater uniformity of characters in female genitalia, which were not studied by Berio & Fletcher. However, two males from Java (slides 19104, 19105) indicate these Javan females may belong to a further species allied to gluta. The males have a valve apex tending towards that of gluta, but spatulate rather than acute; the more basal processes of the valve are more as in infernalis. The tegumen is ventrally narrow as in parva, though the uncus and processes flanking it are more as in infernalis.

Geographical range. Borneo.

Habitat preference. Most material is from lower montane forest from 900m to 1630m, though two females have been recorded from 300m in the Ulu Temburong of Brunei. The species is known from G. Kinabalu, G. Marapok, G. Mulu, G. Api and Bukit Retak.

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