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Caeneressa Obraztsov
Type species: diaphana Kollar.
This genus was erected by Obraztsov (1957a) to embrace a large number of
Oriental species that had previously been misplaced in Amata or in Eressa
Walker. Eressa sensu stricto was reviewed by Obraztsov (1954), and is
discussed above.
The wing venation of Caeneressa (Fig. 3) has already been
discussed on Subfamilies Syntominae and
Euchromiinae. In the hindwing it resembles that of Eressa. In the
forewing pattern there is usually only a single transparent zone or pale patch
in the space posterior to CuA2.
In the male genitalia the valves are usually broad, long, simple,
unornamented, often with the saccular bases fused to a small central, triangular
sclerite (the juxta), or one shaped like an inverted V, (also seen in Eressa).
The valve is typically very slightly constricted centrally. The aedeagus
vesica is usually simple with scobination general throughout, or in an extensive
field.
In the female genitalia the ostium usually intrudes into the posterior
margin of the seventh sternite. There is a single signum set ventrally,
centrally in the bursa, elongate longitudinally, with the lateral scobination
stronger than that in the centre.
In Borneo there is a large number of species, including the type
species. Most fall within a distinctive Sundanian group with rather dark facies,
defined by white basal spots on the tegulae (robusta to longipennis). A
number of small species are also included for reasons given in each case, though
in some instances this placement may have to be reviewed when further material
becomes available.
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