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Oxaenanus
Swinhoe
Type species:
aemula
Walker
This genus shows marked sexual dimorphism of facies, females tending to resemble each other more closely in the diffuse, oblique, slightly sinuous fasciation of the forewing, the zone between the medial and slightly double postmedial being paler and containing a dark, bipunctate discal mark. The submarginal is more irregular, biarcuate. On the underside, the fasciation is less pronounced, and the hindwing has a dark discal lunule but no orbicular stigma. Males of the type species have the forewing fasciation emphasised by black components on each side of the antemedial and postmedial at the dorsum, whereas in the three other species (kalialis Swinhoe is the only one of these where females are known) the male facies above and below is almost entirely uniformly dark blackish brown.
The labial palps of the male are diagnostic, the first segment directed strongly forwards, with the second and third extending acutely back from it, forming a sort of beak. The second and third are difficult to distinguish from each other, the second appearing shorter, but together these segments extend to well beyond the posterior margin of the thorax, and are flattened against each other, enclosing a fringe or pencil of much paler hair-scales within their length. The foretibia is short, well scaled, but no sheath is apparent. However, it ends in a spine on the same side as the cleaning spur. The male antennae are fasciculate.
In the male abdomen, the eighth segment is unmodified apart from well separated tergal apodemes as in Bertula and allies. In the genitalia the saccus is narrow, tapering, acute, but the uncus and valves are variable in shape, the latter with the saccular apex variably produced except in kalialis where the valves are more robust, tapering, slightly sinuous to the upturned, acute apex. The vesica is at a right-angle to the aedeagus when everted and usually has several short diverticula; these are strongly scobinate and/or spined only in kalialis and the type species.
The female genitalia (type species) have a slightly expanded basal section to the unsclerotised ductus bursae and general scobination over about two thirds of the corpus bursae. In addition to the species below, there are also two species in the Indian Subregion (Poole, 1989).
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