16-17mm. This and the next species are very similar in facies, with blackish
brown clouding on a rather pale emerald green ground. The clouding is stronger
in thalasscura such that the unclouded roughly triangular area medially
at the costa is more conspicuous. The hindwing has a more distinct discal lunule
on the upperside than the next. Both differ from preceding members of the
jucunda group in having more robust genitalia with shorter valves and a more
distinctive costal flange. This is somewhat trapezoid in thalasscura and
set opposite a concavity in the costal margin that is bounded distally by a
slight protrusion. The aedeagus lacks conspicuous spines, and the vesica has a
narrow diverticulum tipped with fine spicules as in jucunda.
BRUNEI: 30-60m, Labi, lowland forest, 20.8.1979 (Lt. Col. M.G. Allen), BM
noctuid slide 16687.
BRUNEI: 300m, Ulu Temburong, rainforest, 25.9.78 (Lt. Col. M.G. Allen); 1
Retak, LP 238, 1465 metres, BRUNEI, 23.iv.1981 (T.W. Harman); 1
S.E. BORNEO: Samarinda, x.1938 (M.E. Walsh); 1
SABAH: Telupid, 9-22 Sept 1987, Coll FRC, Sepilok.
Geographical range. Borneo.
Habitat preference. Four of the specimens are from the lowlands but one is
from 1465m in montane forest.
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