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Suana
Walker
Type
species: ampla Walker ( = concolor Walker)
Both sexes
have rufous brown forewings traversed by four darker, usually wavy
fasciae. Between the first and second fascia a white discal spot is often
present, and the zone between the second and third is tinged greyish.
There is sometimes a pale subbasal spot in the male, and the irregularly
stepped submarginal has similarly paler patches basad to each section,
particularly subapically. The male forewings are shaped as in Metanastria,
Streblote and Paralebeda males; those of the females have the
dorsum and margin continuously curved and the costa also more curved than in the
male, the two curves meeting at the acute apex.
The male antennae
are strongly bipectinate, more broadly so over the basal half, those of
the female hardly so.
The male
genitalia are similar in general structure to those of the genera already
discussed but the cubile arms are weakly sclerotised plates forming the
interior base of the saccular pouch, and the eighth sternite consists of
two sclerotised triangular plates.
The larva
was described by Gardner (1941). The prothorax has two well developed
lateral protruberances on each side, the other segments a single
ventrolateral one. The meso- and metathorax each bear a dark, transverse
brush of black, stiff needles, each raised well above the body line and
bordered with pale spatulate setae; similar setae fringe the pronotum and
adorn the lateral protruberances. There are small verrucae. The skin is
pale brownish grey with very fine dark brown reticulation.
The genus
contain three species: the widespread concolor Walker, a new
Sundanian species and a very dark brown, undescribed species from Sulawesi.
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