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Diomea roydsi sp. n. 
11, 13mm. This is a species the size of rotundata but with facies more as in dialitha, though with less prominent white dots on the postmedials. The forewings are slightly more produced apically. The hindtibia is tufted with black scales as in rotundata, but the species lacks the rufous brown rectangle at the hindwing tornus. In the male genitalia the saccus is shorter, broader than in the other species, and the tegumen is relatively longer. The valves are narrower, the sacculus narrow throughout, terminating in a short, upturned spine.

Diomea roydsi 

. Dutch West BORNEO, 85 miles above Pontianak (Simons et Meligan (Sanggan) Meligan (Sanggan)) ex Janson, April 1903, BM noctuid slide 18549.

Paratype . BRUNEI: 3m, Mumong, secondary and coastal veg., 15 Nov. 1979 (R. Fairclough), BM noctuid slide 18544.

Geographical range. Borneo.

Habitat preference. Both specimens are from the lowlands.

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