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Perixera
dithyma Prout comb. n.
Anisodes dithyma Prout, 1938, Gross-Schmett. Erde, 12:
172.
Diagnosis. This is another species with a pale yellow ground as in denticulata and
the ochraria group and allies, but the forewing costa is pale as in the
former. The discal spots of both wings are pale-centred, both larger than in denticulata.
The forewing medial is more angled, less oblique, and the abdomen has pale
brown patches dorsally.
Taxonomic notes. None of the Perixera characteristics are present in the male
genitalia, though the rather rectangular valves lack the setal field and the
costal and saccular spurs typical of Cyclophora. The uncus is vestigial,
triangular, and the valve has a slender, sigmoid arm arising from the base of
the costa. The apex of this arm has a row of rather peg-like setae. P.
obviata Prout comb. n. (New Guinea, Queensland, Seram, ?Sulawesi) is
sister-species to dithyma: the valve costal process is very much shorter,
broad, not sinuous.
Geographical range. Borneo, Sumatra.
Habitat preference. Material seen is from the lowlands of Kalimantan,
from alluvial forest with kerangas in the Mulu area and from dipterocarp forest
at Ulu Temburong in the lowlands of Brunei.
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