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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  |
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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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