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Eressa Walker
Type species: confinis Walker (Indian subregion to Peninsular
Malaysia and Sumatra).
The most typical members of this genus were reviewed by Obraztsov
(1954). None occurs in Borneo.
In venation and wing markings the genus resembles Caeneressa Obraztsov.
In the male genitalia the tegumen is robust with internal processes., The uncus
is broad, triangular, with slight lobes basally and laterally. The valves are
short, rounded, the juxta like a rounded, inverted ‘V’, between the saccular
bases; the aedeagus is slender, evenly curved, the vesica unornamented. In the
female genitalia, the eighth segment is a darkly sclerotised ring of even
thickness, with the ostium centrally within it. There is a single, central,
rhomboidal, scobinate signum similar to that of Caeneressa.
Two Bornean species are here assigned to the genus, E. vespina having
Eressa as its current combination and being represented by only a single
specimen, precluding determination of a more satisfactory placement through
dissection.
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