The Eugoa Walker group of genera
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Eugoa crassa Walker
Lyclene crassa Walker, 1862, J. Linn. Soc. (Zool.), 6:114.

Eugoa crassa (x 1.56)

Diagnosis and taxonomic note.
This species is the first of a sequence of six with rather similar forewing facies consisting of a single blackish discal dot, just interior to a diffuse but broad and conspicuous postmedial that is oblique and slightly curved so as to be concave distad. The male antennae are ciliate to serrate, and bipectinate in the sixth species. The first three species have the hindwings predominantly pale yellow to brownish yellow, and the rest have it brown or brown over the distal half. The first three species have lateral flanges to the saccus in the male genitalia. The largest of the six are crassa and its sister-species, with the postmedial much more oblique than in bipuncta Heylaerts. These sister-species are distinguished in the description of the next species.

Taxonomic note. Unfortunately the type of crassa, a male, is badly damaged, retaining only one hindwing, and the abdomen proved to be devoid of genitalia. The original description suggests the forewing facies is characteristic of this sequence of species, the fasciae oblique, and the hindwing lacks the grey border of inconspicua Walker which, with indeclaratana Walker, was placed as a synonym of crassa by Hampson (1900); both are treated as distinct species below. It is therefore assumed that crassa is as described above or the next species, and is more likely to be the more lowland of the two.

Geographical range. Borneo.

Habitat preference. The species is frequent in various types of lowland forest, including that on limestone, wet heath forest and alluvial forest.

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