TRIBE NYGMIINI n.
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Orvasca sciasticta Collenette comb. n.
   
Porthesia sciasticta
Collenette, 1938, J. Fed. Malay St. Mus., 18: 264.
   
Euproctis tina
Collenette, 1949, Ann. Mag. nat. Hist. (12), 1: 702, syn. n.
   
Euproctis tengger
Collenette, 1949, Ann. Mag. nat. Hist. (12), 1: 720, syn. n.


Orvasca sciasticta


Orvasca sciasticta


Diagnosis.
Both sexes have fine, whitish, antemedial and postmedial fasciae on the forewing as in subnotata, but the sexual dimorphism is much more extreme. The male has a pinkish brown-grey zone over much of the base and centre of the forewing surrounded by marginal zones of yellow ground colour, that distally being broader and not broken into patches. The female has the hindwing scales apart from the white fasciae.

Taxonomic note. Schintlmeister (1994) treated tina and sciasticta as distinct, illustrating another male as that of the latter. However, the fine fasciae of tina males match those of sciasticta females better in their course than does that of the other male. This male has more sinuous fasciation, with the antemedial angled distad subdorsally, and with the postmedial in a relatively distal position. It may be the male of the females discussed next. The male genitalia illustrated by Schintlmeister (1994: fig 110) as of sciasticta match those of tina. It is possible that those attributed to tina in his fig 111 are those of the other male which probably is undescribed. The structure of the uncus, with lateral processes, may indicate a closer relationship to the last three species treated under Orvasca here, and possibly to the next genus.

Geographical range. Sundaland.

Habitat preference. The species is rare, with only five specimens seen from Borneo: at 300m in the Ulu Temburong, Brunei; at about 500m at Poring in Sabah; at 1465m on Bukit Retak and 1680m on Bukit Pagon in Brunei; at 1200m (Bundu Tuhan) on G. Kinabalu.

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