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Ilema vaneeckei Collenette
stat. rev.
Dasychira
vaneeckei Collenette,
1932, Novit. zool., 38: 86.
Dasychira
callima Collenette,
1932, Novit. zool., 38: 89, syn. n.
Dasychira
vaneecki Collenette;
Holloway, 1976: 51.
Ilema vaneeckei 
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Ilema vaneeckei |
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Diagnosis. There are two forms of this species, both with dark green forewings. The
typical one has the hindwing yellow with three blackish spots: a discal lunule
and subapical and subdorsal sections of the submarginal. The callima form
has the hindwing dark brown except for a narrow marginal zone of brownish orange
(clearer in Sumatran specimens). The next species, montanata Holloway,
has only been taken in the yellow form. It is larger and perhaps more lightly
marked on the hindwing, but can only reliably be distinguished from the male
genitalia, where the uncus is broader, and much less distinctly bifid. The more
ventral of the two apical processes on the valve is vestigial in montanata.
Taxonomic note. Schintlmeister (1994) regarded this and the next species as referable to
I. chloroptera Hampson (N.E. Himalaya), which shows a similar kind
of dimorphism but with the outer border of the hindwing submarginal more distant
from the margin, and with this broader marginal zone a clear yellow in the form
with a dark hindwing. There are also small but consistent differences in the
male genitalia, as discussed above for the two Sundanian species. In chloroptera
the uncus is bilobed as in vaneeckei, but the tegumen is also
slightly shouldered on either side of it. The valves are longer, apically
produced and rounded between the two processes, the processes being more robust
and more equal in size. The aedeagus is longer in chloroptera and more
strongly curved over the basal part rather than evenly curved.
Geographical range. Peninsular Malaysia, Sumatra, Borneo.
Habitat preference. The species occurs infrequently in a range of lowland
forest types, including heath forest.
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