Risoba glauca Hampson, 1912, Cat. Lepid. Phalaenae Br. Mus., 11: 428.
Diagnosis and taxonomic note. This species, R. chlora Hampson
(Singapore and Peninsular Malaysia) and the undescribed Sumatran and Peninsular
Malaysian species (slide 16700) all have a similar, mostly green, fawn and grey
forewing facies but differ in the male genitalia. In glauca there is a
more clear, unbroken pale fascia postmedially; chlora is a brighter
green; the undescribed species is a browner green. All three have a triangular
process costally on the valve of the male genitalia similar to that of
harmani but based within the valve rather than on its costal margin. In
glauca there is a prominent but short crest of spines centrally, dorsally on
the aedeagus; the vesica diverticulum is short but with a row of slender spines
apically. In chlora (slide 16693) the valve process is more bilobed, the
aedeagus without spines but with a broader vesica having a central row of more
robust spines. The undescribed species may represent glauca in its
localities, but has a longer aedeagus with only a weak cluster of short spines
centrally; the vesica is similar but the Sumatran male (16700) has the apical
spines more robust and broadly based.
Geographical range. Borneo.
The species is
infrequent in the lowlands.
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