Miscellaneous Genera VI
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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

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 “Loxiodamediofascia 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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