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Arthisma Moore
Type
species: scissuralis Moore,
Singapore.
Species
of Arthisma
mostly
have brick red forewings with the marginal fringes at least partially white. The
fasciae are mostly darker and irregular, lunulate. The hindwings are a similar
colour to the forewing but may differ slightly in tone and are more uniform; in
males, the dorsum is partially separated as a narrow lobe at the margin. The
male antennae are ciliate.
In the
male abdomen, the eighth tergite is narrow, triangular, with a deep circular
excavation in its anterior margin. The sternite is much broader, with a
biangular anterior margin, and also tapers sharply posteriorly. It has a slight
lacuna just distal of centrally. The genitalia have the scaphium markedly
displaced up the uncus. The valves are very broad, with extreme coremata and in rectilinea
Roepke,
a strap-like detachment from the ventral margin. The valves associate closely
centrally and with the vinculum, the latter short, but deeply excavate. The
juxta and anellus appear similar in structure to those of Lineopalpa.
The aedeagus is similar to that of other members of the tribe.
In the
female, the genitalia are very similar to those of Savara,
with a short sclerotised section in the long ductus bursae basal to the origin
of the ductus seminalis. The corpus bursae contains two longitudinal scobinate
bands, long in the type species, but shorter with slight bosses at each end in rectilinea
Roepke.
The
genus includes the two species described below, with the addition of amisa
Swinhoe
from Savara.
It is completed by A. pectinata Wileman & West (Philippines: Luzon),
where the male antennae are bipectinate.
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