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Amphigonia Guenée
Type
species: hepatizans Guenée, East Indies.
Synonym:
Acygoniodes
Hampson
(type species hepatizans).
All
species in this genus occur in Borneo and have a distinctive wing shape and
facies, the former in the forewing consisting of strong central angles to the
wing margins; the angles on the hindwing are somewhat produced into short tails.
The wings are a rich, dark, purplish brown with darker fasciation. The marginal
zone of the forewing is distinctly paler, the basal boundary to this zone being
strongly arched over part of its course, with a paler zig-zag submarginal being
evident within the arch. The reniform is more or less divided into two, and each
portion has a slightly more rufous centre.
The male
abdomen has the eighth segment unmodified apart from short apodemes on the
tergite. The uncus has a horned apex, and a scaphium is present.The valves are
narrow, with a spatulate apex set between costal and saccular processes as
illustrated, more developed in the type species. The juxta could be a broadened
form of the catocaline inverted ‘V’ or ‘Y’. The aedeagus vesica has
several diverticula, with areas of scobination but no cornuti.
In the
female (motisigna Prout), the ostium is set between the apex of the
triangular seventh sternite and the extended corners of the corresponding
tergite.
The
ductus is sclerotised, moderate to short. The corpus bursae is elongate, without
a signum but generally scobinate. The genus consists of the species described
below. The biology of the type species is also described.
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