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Necyopa Walker
Type species: flatipennata Walker
Synonym: Polylophodes Warren (type species triangularis
Warren, Java). The species in this genus are brown or greenish brown,
usually with paler medial zones on both wings. The male hindwings are rather
triangular in many species, with a streak of dark scales at the tornal angle in
some. A fovea is present. The male antennae are bipectinate.
In the abdomen there are at least four pairs of coremata between
segments 3 and segment 8, that between segments 5 and 6 lacking in all except N.
ioge Prout.
The pair between 6 and 7 is double in all except the type species, and
segment 7 is elongate and has the most distal pair of coremata arising just
within it.
The male genitalia have the uncus bifid as in Chrysoblephara, the
gnathus strong, with a narrow, tapering apical portion. The valve has no
saccular ornamentation but there is a strongly setose, digitate process
subbasally on the dorsal margin of the valve, possibly derived from the costa
and cucullus. In all except the type species there is a corema at the apex of
the valve.
The female genitalia have the bursa elongate, mostly immaculate, and
lacking a signum.
The genus is virtually restricted to Sundaland
and has four species in Borneo. In addition there is N. triangularis Warren
(= anetotasis Prout syn. n.) from Java. The taxon picta Warren
(Java) may represent the female of triangularis. All except the type
species are montane (see Holloway, 1991).
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