The Eugoa Walker group of genera
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Eugoa indeclaratana Walker stat. rev.
Tospitis indeclaratana Walker, 1863, List Specimens lepid. Insects Colln Br. Mus., 28:427.

Eugoa indeclaratana
(x 1.56)

Eugoa indeclaratana
(x 1.56)

Diagnosis and taxonomic note.
This species begins a sequence of small, rather noctuid-like members of the genus, the first few of which have a rather triangular forewing with, in the male, a convex dorsum that overlaps an area of smooth modified scales at the anterior of the hindwing. The forewings are usually a uniform, speckled medium brown, sometimes with a dark discal dot, but species later in the sequence are more fasciated. The male genitalia often have a distinct saccular process that is adjacent to or curves over the main part of the valve. The aedeagus vesica usually has cornuti. E. indeclaratana is the only species with straw-coloured hindwings, and these are only seen in the male. Both sexes have a faint discal dot on the forewing, distinguishing the females (tentatively associated) from those of the next species, as well as a more finely speckled ground. Both species have the head and patagia straw colour. This species was placed in synonymy with crassa Walker by Hampson (1900). It is related to E. vasta van Eecke (Sumatra) which has a similar setose transtilla structure and valve shape, but lacks the two cornuti in the aedeagus vesica of indeclaratana.

Geographical range. Borneo.

Habitat preference. This is an uncommon species of lowland forest, being recorded up to about 600m.

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