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Birthamula Hering
Type species: chara Swinhoe
The species have dark brown forewings with irregular darker submarginals;
the anterior two thirds of the marginal zone is variably pale fawn to brown, the
interior border of this patch separating from the submarginal posteriorly to
meet the costa. The male antennae are bipectinate to the apex, tapering away
there. The postmedial meets the dorsum obliquely posterior to the discal dot,
rather than being angled into a chevron there as in the previous genus. The
foretibia has no white spot distally.
The male genitalia have a furca, the arms being long, curved spines in chara,
rectangular bands with two or three spines in the interior corner in diffusa
Hampson (N.E. Himalaya) and small, slender curved blades in altichara. The
uncus is sinuous in profile, the ventral apical or (in chara) subapical
spur being relatively slender, long, acute; the sinuosity is weak in diffusa,
which is possibly sister species to the other pair. The valves are of
similar shape through the genus, with a rather acute apex.
The female genitalia have the ductus spiralled and a crescent signum in
the bursa, though this is short in chara and much reduced in diffusa. The
eighth segment has a distal setose lobe and a central setose swelling in chara,
the former only in diffusa but a complex array of four laterally
elongate lobes in altichara.
The larva has the same shape and configuration of dorsolateral tubercles
as those of Setothosea, Birthosea and Setora.
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