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Idaea vacillata Walker 
Acidalia? vacillata Walker, 1862, List Specimens lepid. Insects Colln Br. Mus., 26: 1608.
Chrysocraspeda phaenicozona Hampson, 1895, Trans. ent. Soc. Lond., 1895: 313.

Idaea vacillata
(x 1.16)

The purple borders of the wings are almost twice as broad as in phaeocrossa. See Idaea phaeocrossa Prout.

Taxonomic notes. Subspecies phaenicozona is larger, with dark grey, rather than pale straw, male hind-tibial scent-pencils. The male genitalia lack a pouch on the second sternite but the valves have basal coremata. The aedeagus is large, the vesica with three cornuti (much more even in size and smaller in phaenicozona). In the female, the bursa has a broad, complex, highly spinose basal portion and a narrower, elongate, immaculate distal portion.

Geographical range. Borneo, Peninsular Malaysia; N.E. Himalaya, Hong Kong, Tonkin (ssp. phaenicozona).

Habitat preference. In recent surveys four specimens have been taken in dry heath forest at Telisai and one in hill dipterocarp forest at Ulu Temburong, both lowland localities in Brunei.

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