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Fentonia Butler
Fentonia sumatrana
Kiriakoff
Fentonia
ocypete sumatrana Kiriakoff, 1974: 412.
Fentonia
sumatrana
Kiriakoff; Holloway, 1982: 204, fig. 30.
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Fentonia sumatrana 
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Diagnosis. This species is slightly smaller than helena, a less brown grey,
with the forewing postmedial closer to the margin, especially subapically, and
traversing the pale subtornal area to meet the dorsum more or less at right
angles rather than obliquely. The hindwing is paler and rarely has a diffusely
darker border.
Geographical range. Sundaland.
Habitat preference. The species is found most commonly in lowland rain
forest, but was also frequent at 900 m (lower montane forest) on the limestone
of G. Api and at 1618 m (upper montane forest) on Bukit Retak.
Biology. The larva of F. ocypete Bremer, an E. Asian relative of sumatrana,
was illustrated in Issiki (1969). It has a reticulate/striate pattern,
variably fine and coarse, of deep reddish brown on variably pale greyish fawn,
except for large, lateral, rectangular, sea-green patches over the thoracic
portion. It is glabrous, without ornament.
Sugi & Nakatomi (1969) gave Quercus (Fagaceae) as the
host-plant in Japan.
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