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Adra Walker
Type
species: argentilinea Walker,
Borneo.
In the
type species, the male antennae are bipectinate, those of the female filiform.
The lower clypeofrons is unscaled and the labial palps are held obliquely in
front of it, the third segment short and angled slightly forwards. The forewing
venation has an areole; R4 arises independently as does M1. R2 arises from the
areole, but the remaining radial sector veins arise more distally. The hindwing
is quadrifine, but M3 is slightly stalked with CuA1. Both forewings and
hindwings are very narrow, the abdomen extending well beyond the latter in a set
specimen. The forewing facies is an ochreous brown, with an attenuation of pale
and dark, diffuse, angled bands of this colour divided by a pale longitudinal
streak that is slightly broken where crossed by the darker bands. The hindwing
is uniform fawn.
The male
abdomen has an eighth tergite that could be a broadened form of that associated
with the framed corematous condition. However, the sternite is much broader,
larger and is strongly bilobed distally. The anterior margin lacks a
lacuna but has a pair of well separated apodemes
(seen also in Calathusa Walker, a possible relative). The genitalia have a
centrally broken uncus and simple, tapering valves with basal hair pencils. The
inner margins of the valves almost meet centrally just ventrally to a broad,
slightly bilobed juxta. The aedeagus vesica is broad, reflexed when everted and
lacking conspicuous ornamentation.
The only
female has lost its abdomen.
The
genus consists of the type species and A. nicobarica Hampson
(Nicobar Is.), the latter represented by only the holotype male, its antennae
less strongly bipectinate than in argentilinea.
A second Bornean species is described below. Though superficially similar, it
differs in a number of features such as in the male antennae and in venation, as
well as in genitalia features.
The
larva of the type species has been recorded as feeding on Casuarinaceae (see
below); the genus may therefore be allied to Calathusa Walker,
which has been recorded several times from this family (Holloway et
al., 2001).
This genus was originally associated with the Sarrothripinae; it was placed with
the Hypeninae by Nielsen et al. (1996). Male abdominal features such as the apodemes
on the eighth sternite and the general form of the genitalia (Holloway, 1979)
may support this.
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