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Mecodina
diastriga Hampson
Mecodina
diastriga Hampson, 1926, Descr. Gen. Spec. Noctuinae,
p. 491.
Diagnosis.
This is the smallest of the Bornean species, purplish grey, having a rather
irregular and variably sized subapical dark mark on the forewing costa and
usually a corresponding dark bar submarginally at the hindwing dorsum. See also
the taxonomic note following; the other two species may occur in Borneo also.
Taxonomic
note. This species is one of three that have very similar facies. M.
metagrapta Hampson
(Bali, Java, Singapore, India, Sulawesi (slide 19239)) is smaller, slightly
browner, with a shorter forewing reniform lunule that is highlighted paler. The
male of metagrapta from
India (Belgaum) listed by Hampson in his original description (mislabelled as a
type in BMNH) has genitalia (slide 19174) as in diastriga.
A male from E. Java, possibly diastriga (the type is female), has genitalia similar to those
from Borneo, except the shorter diverticulum to the aedeagus vesica is more
heavily spined. M.
analis Swinhoe
(Burma) is a similar size and purplish grey colour to diastriga,
but has a more strongly fasciated underside to the hindwing. The male genitalia
are much larger, the valves narrow with a prominent rectangular protrusion
ventrally in the region of the sacculus. The aedeagus vesica is larger, longer,
more convolute and scobinate.
Geographical
range. Java, Sumatra, Borneo, India.
Habitat
preference. Five specimens were taken during the Mulu survey from lowland
alluvial forest and one from lower montane forest at 1000m.
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