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Trichaetoides Gen.
n.
Type species: divisura Walker
This genus is proposed to contain those species currently placed in Trichaeta
Swinhoe that do not correspond in genitalic morphology to its type species, teneiformis
Walker (India). Its principal diagnostic feature is a transverse ridging of
both signa in the bursa of the female genitalia; in teneiformis there is
a single, weak basal signum. In the male genitalia the valves are usually rather
small. The aedeagus vesica is large, globular, with broad patches of scobination
and sometimes lateral lobes with cornuti. Some taxa, but not the type species,
have strong setae grouped on lateral lobes of the tegumen.
The wing venation is similar to that of Amata. M2 and M3 in the
forewing are stalked, and M3 and CuA1 in the hindwing are connate (Fig. 4). The
wing pattern shows degrees of reduction from the multiple spotting of Amata:in
T. separabilis Walker and T. vigorsi Moore all elements are
present; in the type species the distal patch posterior to CuA2 is lost; in T.
borealis Rothschild the cellular patch is lost; the remaining taxa show
degrees of expansion and fusion of the two most distal forewing patches, and
reduction or loss of the basal patch posterior to CuA2 and the patch on the
hindwing. The species are treated in this order below, and similarly illustrated
in Plate 2. T. separabilis has the abdomen ringed with white basally
and narrowly at two-thirds. All other Bornean species have the abdomen entirely
black.
The genus has so far only been noted from Sundaland and includes, as
well as the following taxa, T vigorsi Moore comb. n. (Java) and T.
proleuca Hampson comb. n. (Sumatra).
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