13mm. The male antennae are fasciculate. The labial palps are upcurved, relatively short, particularly the third segment; this bears a triangular crest of scales dorsally. The wings are a dark greenish brown, the forewing crossed by a pale cream-coloured transverse band defined by a clearer cream postmedial in the centre of the wing, and a more obscure antemedial in the subbasal position, roughly parallel. The postmedial has a slight projection distad just anterior to its centre. The main area of the band is variably suffused with brown, particularly along its central axis. The species resembles momusalis and allies to some extent, but the strength and transverse quality of the pale band in relation to the dark background are definitive. The male genitalia have a rather sinuous uncus (viewed laterally) and deeply divided valves, the costal part tapering to a stiletto with small appressed spines distally and a rounded to triangular flap basally, and the ventral part extending further, more digitate and gently zigzag over the central portion. The aedeagus vesica is generally as in other Bertula species but with a band of relatively coarse scobination running transversely to the axis of the aedeagus.
Holotype. MALAYSIA: Sabah, Danum Valley, 170m, 4°58' N 117°48' E (S.J. Willott), 2° understorey, Bkt. Atur Rd. DVFC, 26.i.94, BM noctuid slide 19457.
Geographical range. Borneo.
Habitat preference. The only specimen is from an area of lowland forest regenerating after logging.
