Type species: xylinaria Walker.
Synonym: Prorocorys Warren (type species gemmata Warren, Solomons,
The general appearance of species in this genus is similar to that of Horisme
species, but with distinctive darker shading obliquely postmedially or
costally on the forewing. Prorocorys has the wings mostly blackened, with
bluish grey flecking towards the margin, but the obscured transverse fasciation
is as in typical Ziridava as are the characters of the male genitalia.
The male antennae in the type species and allies are filiform, densely scaled
and invested with very short cilia: they are slightly swollen over the central
part. Those of Z. rufinigra Swinhoe are bipectinate.
The male genitalia typically have the uncus reduced to a short trident,
the labides are well developed and the valves are long, strap-like, with the
costa broadened over a short basal section. The saccus is rather broad, square.
The aedeagus vesica is globular with one or two patches or rows of narrow, short
cornuti. Z. rufinigra and Z. asterota Prout have the uncus simple
and the aedeagus vesica lacks patches of cornuti.
The female genitalia typically have short, rather square ovipositor
lobes, a short ductus and an ovate bursa from which the ductus seminalis arises
from a small lateral lobe basally. The signum is a scobinate patch from which
runs an oblique scobinate pleat. In rufinigra the bursa has a long neck,
the ductus seminalis is not on a lateral lobe, and the bulb is densely spined
Holloway (1982) reviewed most of the typical group which ranges from
India to Taiwan and New Caledonia: Prorocorys also belongs to this group.
But asterota and rufinigra are distinct from this group and may
not be congeneric with it, though probably related to each other. Z. dysorga Prout
(Samoa) and Z. smithersi Holloway (Norfolk I.) have general facies
characters as in Ziridava but lack the definitive features of the
genitalia (Holloway, 1977). The latter is transferred to Gymnoscelis
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