Diphthera jucunda Walker, 1862, J. Linn. Soc. (Zool.), 6: 178.
Diagnosis. The forewings are somewhat similar to those of calaina but
a more emerald green and with finer black fasciation that does not include
blocks; the postmedial is doubled over the central part by a fainter inner line.
The hindwing is more obscured with brown over the paler basal part. The valve of
the male genitalia is similar to that of the previous two species but the
aedeagus lacks a central comb of spines, and the diverticulum of the vesica has
several fine spicules at its tip.
Geographical range. Borneo, and noted for Sumatra by Martini & Thöny (1993).
Habitat preference. Most recent material has been taken between 75m and 450m
in the lowland forests of Brunei, but Martini & Thöny (1993) recorded one at
1600m on G. Kinabalu.
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