Gespanna Swinhoe

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.