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Visiana Swinhoe
Type species: sordidata Moore.
A group of large, brown species related to sordidata was
distinguished from Xanthorhoe by Holloway (1986b: 542). This
separation was supported by Nielsen, Edwards & Rangsi (1996). The group
lacks the calcar in the male genitalia used to define the broad concept of Xanthorhoe
above, and has a number of other distinctive features. The male antennae are
bipectinate to the apex, and the eighth abdominal segment is as in Xanthorhoe.
The valve apex terminates in a spine. The tegumen and vinculum appear to
be fused, with an inwardly directed spur at their point of junction,
particularly well developed in the type species. A similar, possibly homologous
feature is seen in the Australasian Crasilogia Warren group of genera
(Holloway, 1984b and in Gonanticlea Swinhoe, discussed next). The saccus
is well developed. The uncus is rather short, triangular, broadly based.
In the female the bursa is large, asymmetric, the ductus seminalis
arising from a lateral lobe in a rather broad, convoluted basal region. There is
no signum.
Other members of the genus are: V. brujata Guenée (E.
Australia); V. excentrata Guenée (E. Australia); V. vinosa Warren
comb. n. (New Guinea); V. hyperctenista Prout comb. n. (Vulcan I., off
New Guinea). There is an undescribed species in Sulawesi.
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