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Blasticorhinus Butler
Type
species: rivulosa Walker,
India.
Typically,
species of this genus have facies much as in the Bornean one illustrated here,
in shades of brownish grey. The forewing is more strongly patterned than the
hindwing, with slight variegation in transverse bands, these often bounded by
fine, dark fasciae except for the submarginal that is paler, parallel to the
margin except for the anterior third where it curves to the apex. The forewing
postmedial is the most irregular fascia, dentate around the bipunctate reniform
stigma. The male antennae are fasciculate, and the legs are tufted with scales
and hair pencils, particularly on the tibia. The labial palps have a moderate,
rectangular second segment and a short third segment. Phragma lobes are shallow
on the second abdominal tergite or vestigial, a feature also shared with Loxioda
Warren.
The male
abdomen has a weakly developed framed corematous eighth segment. The uncus is
long and slender, the valves very narrow distally, sometimes with a small
lateral process, but broader at the base, where the sacculi meet centrally. The
tegumen is relatively broad, the juxta weak. There is a slight saccus. The
aedeagus vesica is large, with several lobes and some scobination. In these
features, the genus resembles Loxioda.
In the
female genitalia, the eighth segment forms an incomplete ring, with a narrow gap
ventrally. The ostium is within a semicircular concavity in the posterior margin
of the seventh sternite, which is therefore broadly bilobed. The ductus is
moderate, fluted but not sclerotised. The corpus bursae has a well defined
appendix bursae that gives rise to the ductus seminalis, and both can have areas
of coarse scobination.
Species
with typical facies occur in eastern Asia, the Indian Subregion and Sundaland
(the species below), but a number of African species are also included (Poole,
1989) the placement of which requires reassessment. See also comments on B. hampsoni Bethune-Baker
from New Guinea under “Loxioda” mediofascia Swinhoe
below.
The type
species has been reared from Pueraria (Leguminosae)
(Robinson et al., 2001). The Japanese and east Asian B.
ussuriensis Bremer
feeds on various woody Leguminosae such as Lespedeza,
Millettia,
Robinia
and
Wisteria
(Miyata,
1983; Sugi, 1987), though Miyata also noted Quercus (Fagaceae).
The larva illustrated by Sugi is slender, longitudinally banded in various
shades of greyish brown, medium dorsally, paler subdorsally and, with an abrupt
boundary (Mutuura et al., 1965), darker laterally. The anal prolegs are splayed out
behind. The condition of the abdominal prolegs is not obvious from the
illustration. The primary setae are long.
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