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Gespanna Swinhoe
Gen. rev.
Type
species: pectoralis Walker,
Borneo.
Poole (1989) placed this genus as a synonym of
Bematha
without
comment but placed its type species in Bematha as
a new combination. These monobasic genera are considered distinct here.
The male
antennae are bipectinate in Gespanna rather
than fasciculate. The male forelegs are less densely scaled than in Bematha,
but the hind-tibia has a prominent hair-pencil. The wing shape and facies are
described below.
The male
abdomen has the eighth segment somewhat as in Bematha,
but the tergite has a lacuna as well as the sternite. In the genitalia, the
uncus is short, domed, with an apical spur, but there is no scaphium. The juxta
is a very broad, inverted triangular plate and not typically catocaline. The
valves have a globular exterior corema centrally, a tapering apex, and a
somewhat complex knobbed and spurred structure to the base of the costa, and
basal to the corema. The aedeagus vesica is not as scobinate or extensive as in Bematha,
but has two major lobes that each terminate in a dense bundle of dark apicules.
The
female has its ostium in a similar position to that of Bematha
and
is also flanked by scobinate structures, but the ventral lip of the ostium is
extended in a tongue-like manner. The ductus is moderate but narrow, sclerotised
with fluting that extends into the tongue structure. There is a slight
constriction at the junction with the bursa which is smaller, more ovate than Bematha,
and much less scobinate and corrugated. Dense, fine scobination is mostly
restricted to a large, irregularly elliptical patch in the centre of the bursa.
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