Type species: semihyalina Moore.
Synonym: Trigonoptila Warren (type species latimarginaria Leech,
Japan) syn. n.
Species in this genus are mostly shades of rich brown, pale at the base
of the wings and usually hyaline there, and with a darker marginal border distal
to the postmedial. The forewing antemedial is sharply angled in most species.
The forewings are more or less falcate, and the hindwings have the apex excavate
between veins Sc and Rs, such that there is usually a tail at Rs. A fovea is
present on the male forewing. The male antennae are ciliate.
In the male abdomen the third sternite has a transverse setal comb. The
valve costa terminates in a cucullus in most species and bears a ventral setose
lobe more or less centrally, though this is very weakly developed in K.
lucidaria, and modified into a slender, angled process arising dorsally from
the base of the costa in K. oliveomarginata Swinhoe. This last species has
lost the cucullus and has an expanded, marginally angled saccular zone, perhaps
homologous with the saccular spur in the type species of Trigonoptila. The
aedeagus vesica in the genus is variably ornamented, but the aedeagus apex is
usually produced into one or two sclerotised processes.
The bursa copulatrix is pyriform, sclerotised, scobinate over the basal
part, and with a signum of the dentate mushroom type that has the distal margin
straight or excavate, slightly folded over. This feature is probably a generic
apomorphy, seen in rather divergent taxa such as K. latimarginaria Leech
comb. rev. (serving to bring Trigonoptila into synonymy) and oliveomarginata.
In the type species the signum is triangular. The resting posture is unusual
(noted for oliveomarginata and by D. Stüning for the type species) with
the forewings spread well forward, separated from the hindwings in a more or
less cruciform manner.
The genus is most diverse in the Oriental tropics and subtropics but
extends east to New Guinea. Sato & Nakajima (1975) recorded the larva of K.
latimarginaria from Cinnamomum (Lauraceae), a host recorded for the
next, related genus also.
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