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Fascellina pulchracoda sp. n.
Fascellina pulchracoda  (holotype) |
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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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