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Chilkasa Swinhoe
Type
species: falcata Swinhoe,
India.
Synonym:
Acygonia
Roepke
(type species difformis Roepke, Sumatra = falcata).
The
genus is monobasic, with facies, wing shape and sexual dimorphism as described
below. The male antennae are fasciculate but with strikingly long setae dorsally
on each tarsomere over the basal part of the flagellum.
In the
male abdomen, the sclerites of the eighth segment are very shallow, the sternite
a narrow strip, slightly expanded centrally, and the tergite slightly deeper
with two apodemes separated by strongly concave margins. The genitalia have a
long, curved uncus with an apical spur, an inverted ‘V’ type of juxta and a
well developed, acute saccus. The valves are simple, tongue-like, with a
digitate process subbasally. The aedeagus has a subapical knob dorsally. The
vesica has two lobes, the more basal one being itself slightly bilobed, each
lobe invested with numerous scale-like spines directed away from the lobe apex.
In the
female, the ostium is between the seventh and eighth segments but within a
sclerotised loop extending anteriorly from the eighth from the bases of its
apophyses. The ostium leads into a ductus with a short, broad, sclerotised basal
section then a slightly narrower but longer unsclerotised section that broadens
slightly into the narrow, elongate corpus bursae that is sclerotised and
corrugated over the basal third, and membranous, weakly scobinate over the rest.
There is a small patch of more intense scobination just distal to the junction
of these two parts of the bursa. The ovipositor lobes are narrow with a
longitudinal strip of darker sclerotisation as in Catocalini, Catephiini and a
few other genera (p. 38).
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