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Erebus gemmans Guenée
Nyctipao gemmans Guenée, 1852, Hist. Nat. Insectes, Spec. gén. Lépid. 7: 182.
Nyctipao ophristigmaris Hampson, 1895, Trans. ent. Soc. London, 1895: 305.
Nyctipao gemmans ab. gemmoides Strand, 1914, Arch. Naturgesch., 79 (A8): 66.
Erebus gemmans Guenée; Holloway, 1976: 29; Kobes, 1985: 26.

Erebus gemmans

Erebus gemmans

Diagnosis. The postmedials of fore- and hindwings together form a smooth and shallow curve that runs approximately parallel to the distal margins at two-thirds. Two main variants occur: with this postmedial curve entirely edged with a white band; with just a white bar at the forewing costa. There is usually also an irregular row of white patches submarginally.

Taxonomic note. The only Bornean male, when dissected, showed slight differences in genitalia compared with a Himalayan male. It had the ventral angle of the valve apex flexed out more, and the process just interior from this angle is acute rather than ampullate. The aedeagus and the diverticula of its vesica are somewhat narrower.

Geographical range. Himalaya, Taiwan, Burma, Thailand (VK), Sumatra, Borneo.

Habitat preference. Five specimens have been recorded from montane forest during recent surveys: two from 1618m on Bukit Retak and one from 1670m on Bukit Pagon in Brunei; two from 1930m on G. Kinabalu.

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