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Fascellina pulchracoda sp. n.  

Fascellina pulchracoda (holotype)

18mm. This species is allied to the Himalayan F. dacoda Swinhoe in general facies and in features of the male genitalia, particularly in the unusual furca where the right arm is longer than the left rather than vice versa, and the furca base is strongly bilobed, and in the two groups of cornuti in the aedeagus vesica, one with short, stout spines, the other with more needle-like ones. The new species has the forewing margin at the tornus less excavate; there is a strong lenticular zone of yellow anterior to the central kink in the postmedial. The hindwing is distally and subbasally a paler brownish yellow. Both hindwing medial (double) and forewing postmedial have a diffuse mauvish zone distad, forming a more regular band, and more developed than in dacoda. On the underside, the forewing lenticular zone is larger, more regularly elliptical, yellow rather than rich brown. The straight brown band on the hindwing is very much broader. In the male genitalia the right arm of the furca is significantly longer than the left (somewhat vestigial) rather than only slightly so.

Holotype . SARAWAK: Gunong Mulu Nat. Park, R.G.S. Exped. 1977-8 (J.D. Holloway et al.), BM 1978-208, Site 14, February, Camp 2.5, Mulu, 1000m 413461, lower montane forest.

Paratype . BRUNEI: Bukit Retak, moss forest, 1450m, 13-16.ix. 1979 Muzium Brunei/MJS, BM geometrid slide 12722.

Geographical range. Borneo, Sumatra.

Habitat preference. The two specimens are from montane forest: lower montane on G. Mulu and upper montane on Bukit Retak.

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