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Cephena
sundana sp. n.
 ,  16-17mm. The forewings are less elongate than in costata
but
generally very similar in facies. there is some sexual dimorphism, males having
the forewing generally more suffused with rufous and brown, with the diffuse,
angled, transverse fasciae more evident, and females having a more solid block
of brown over the basal two thirds of the costal zone anterior to the
longitudinal streak. In this streak, silvering is restricted to a dot
approximating to the orbicular, and the streak itself is less clearly defined.
In the male genitalia, the valves have the more dorsal angle of the apex
distinctly rounded. the spur from the base of the tegumen on each side is
smaller. The juxta is deeper, more rectangular, but still with dense spining
over its distal part. The spines at the junction of the aedeagus and vesica are
smaller than in costata. In the female the genitalia are generally smaller,
and the scobinate sternal zone of the eighth segment is a transverse strip
rather than a pair of ovate lobes.
Holotype
. Dutch West BORNEO: 85 miles above Pontianak, (Simons et Meligan (Sanggan))
ex Janson, April, 1909, BM noctuid slide 18603.
Paratypes:
2as
holotype; 1
Mt
Marapok, N. BORNEO, 99-71; 1 BORNEO: Pontianack (Ledru),
1897; 1
Ulu
Temburong Expedition 1978, BRUNEI, Base Camp, 325m, LP 283, M.V. light,
15.x.1978 (T.W. Harman), 1 Bidi, SARAWAK, 1907-1908 (C.J.
Brooks).
Geographical
range. Borneo, Peninsular Malaysia (recorded under costata
by
Holloway (1976)), Sumatra.
Habitat
preference. This is probably a lowland species; the only specimen with
precise data is from dipterocarp forest.
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