Walker, 1866, List Specimens lepid. Insects Colln Br. Mus., 35: 1903.
Hampson, 1891, Illust. typical Specimens lepid. Heterocera Colln Br. Mus., 8: 5, 48.
Diagnosis. This is one of the larger Bornean species. The ground colour is
white, but the hindwings grade greyer distad and can appear darker than the
forewings. The forewing postmedial is double, with pale grey between the two
fine blackish elements on each side. The outer element is more distinctly black,
which is expanded at one-third from the dorsum. The double fascia is strongly
flexed at one-third from the costa. The costa bears three plates of pale grey
raised scales subbasally, antemedially and on the postmedial.
Taxonomic note. A similar species, N.
Hampson, with a more angled forewing postmedial, a grey patch centrally on the
submarginal and distinct genitalia (long, slender uncus present, harpe displaced
distally and saccus tapering to a narrow point) flies with fasciata in
Seram and New Guinea.
Turner (Queensland) may be conspecific with diagona.
Geographical range. Indo-Australian tropics to Taiwan and New Guinea.
Habitat preference. The species is common in a wide range of lowland forest
types, and extends with less frequency to as high as 1500m.
Biology. A recorded larval host (Piepers & Snellen, 1904; Robinson et al.,
2001) is Lantana (Verbenaceae).
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