The type species, compared with the Bornean species below, has narrower forewings with the postmedial closer to a more regular reniform and castellated rather than zigzag. The male antennae are ciliate, and the labial palps are slender, tapering, upcurved. The male foretibia has a sheath but this is small, just half the length of the first tarsal segment and two-thirds of its width (Fig 47). The foretibia is not as short as in the Bertula group of genera, and the sheath arises at its distal end.
The male abdomen of the type species has the eighth segment unmodified. In the genitalia, the uncus is large, deep, apically hooked and densely and broadly setose over the dorsal surface. The valves are narrow, apically tapered, with irregular subapical lobing ventrally. There is a large, curved, tapering saccular process that is about half the length of the valves and largely separate from it. The aedeagus vesica is globular and very finely scobinate.
The female genitalia have rather long, narrow, acute ovipositor lobes. The ostium is broad, conical, pocket-like, with a lateral pair of triangular sclerites. The rest of the ductus is short, leading into an ovate corpus bursae that is broadest basally and lacks scobination or a signum.
Apart from the type species and the probably unrelated Bornean one below, Poole (1989) only listed B. borbonica Joannis from Reunion.
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