Ashibusa Matsumura, 1931

Ashibusa Matsumura, 1931: 1087.

Type species: Ashibusa jezoensis Matsumura, 1931 Generic characters. Head with scales appressed, frons protruding forward (Figs 1–2). Antennae longer than 3/4 length of forewing, scape with pectens in basal half. Labial palpi slender, third palpomere slightly longer than second palpomere. Forewing ground color yellow to brown in general, distally with a short white streak from costal margin to termen; R 4, R 5 and M 1 stalked, CuA 2 prolonged into a strong thorn near tornus (Fig. 3). Metathorax with a pair of bundles of setae from its anterolateral corner reaching third abdominal segment in male. Tibiae of hindlegs with whorls of bristles.

Male abdomen and genitalia. Pleural lobes of eighth segment subelliptical in general, with a trifurcate sclerite at base. Left brachium of socius shorter than right brachium, right brachium often with a dorsal process. Left valvella long and slender, right valvella reduced or very short. Valvae narrow basally, widened distally, with dense setae on ventral surface. Phallus stout, without cornutus.

Female genitalia. Papillae anales membranous, obtuse apically. Apophyses posteriores longer than apophyses anteriores. Ductus bursae extremely slender. Corpus bursae longer than wide; ductus seminalis arising from posterior end of corpus bursae; signum absent, or being one or two rows of small denticles if present.

Diagnosis. Species of Ashibusa are similar to those of Stathmopodinae in Stathmopodidae in the hind tibiae with whorls of bristles and the adults erecting hindlegs at rest. Species of Ashibusa can be distinguished by the shape of the head, the labial palpi and the forewings, and the strongly asymmetrical male genitalia (Zhang & Li, 2009: 335).