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Risoba obscurivialis sp. n.


Risoba obscurivialis

15-16mm, 14mm. The facies is similar to that of vialis but the greenish brown is darker on the forewing, and the hindwing border is broader, with the basal pale area suffused dull brownish. The forewing discal spot is more clearly defined and distinctly ochreous. The sexual dimorphism is similar to that of vialis. In the male genitalia the right saccular process has a much more extensive zone of curvature basally and is upcurved rather than downcurved at the apex. The left process is sinuous, expanded at the apex but not bifid as in the rest of the vialis group. The aedeagus is much as in vialis.

Holotype . SABAH: Mt. Kinabalu, 5000 ft., 3.5.1973 (K.M. Guichard).

Paratypes: 1 BRUNEI: 300m, Ulu Temburong, rainforest, 28.4.81 (Lt. Col. M.G. Allen), BM noctuid slide 16677; 1 NORD BORNEO: Mont Kina Balu, 1903 (John Waterstradt); 1 S.E. BORNEO: Samarinda, xii.1938 (M.E. Walsh).

Geographical range. Borneo, Sumatra, Singapore, Bali, Sulawesi, ?N.E. Himalaya (E only from Khasia Hills).

Habitat preference. The species is rare but recorded from the lowlands to above 1500m.

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