Type species: crypsichroma Warren =
The wing margins in this monobasic genus are strikingly
scalloped, angled centrally, the hindwing angled with two small tails. The genus
Episothalma Swinhoe (Episothalma Swinhoe) is similar in appearance, with a dull, deep
emerald green facies with prominent black discal spots above, and irregularly
darker postmedials and submarginals. Facies differences between the two genera
are given in the species description below.
The male antennae are filiform, with short cilia in Euxena
but with long cilia in Episothalma. In the hindwing veins M3 and CuAl
are stalked in both genera. The male abdomen has setal patches on sternite 3 in Euxena
but not in Episothalma.
There are major differences in genitalic features. The male
genitalia of Euxena have a slender digitate uncus set between broad,
falcately triangular socii. The valves are ovate, complexely folded and distally
lobed, with a sinuous, furca like structure basally. There are no coremata; the
saccus is small, acute. The eighth sternite has a small, acute, central process
in the distal margin.
In the female the ovipositor lobes are of the modified
geometrine type. The lamella antevaginalis is broadly bilobed. The bursa is
narrow basally, fluted, and spherical distally with a large, transverse, almost
semicircular flange for the signum.
Episothalma has genitalia with features more typical
of the Hemitheiti (Episothalma robustaria).
to Contents page