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Diplurodes decursaria Walker  
Tephrina decursaria Walker, 1862, List Specimens lepid. Insects Colln Br. Mus., 26: 1659.
Diplurodes decursaria Walker; Holloway, 1976: 80.

Diplurodes decursaria (paratype)

This species generally resembles the first few species discussed, but the forewing postmedial has a more even, if irregular curvature, the discal spot is weak, the basal part of the wing is more or less concolorous with the medial area, and the marginal zone is pale, divided into three by extension of the submarginal grey broadly over M2 and in the space between the CuA veins. An oblique black streak occurs at the position of M2 in the hindwing marginal zone.

Taxonomic notes. This species lacks most of the generic features except the characteristic gnathus, and weak coremata in the generic configuration. The valve is cleft apically, separating the apex of the costa from the rest, and the sacculus is broadly sclerotised but without basal spines. The aedeagus has a saw-like row of spines at the apex.

Geographical range. Borneo, Peninsular Malaysia, Sumatra.

Habitat preference. During the Mulu survey this species was common in the lower montane forest zones of both the limestone G. Api (900m) and the sandstone/shale G. Mulu (1000m). Several specimens were taken at 150m in wet kerangas on river terraces west of the Melinau Gorge. A few were taken at higher and lower elevations on G. Api and one at 1200m on G. Kinabalu.

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