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SUBFAMILY
BAGISARINAE |
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Imosca Sugi & Sasaki Type species: coreana Matsumura (Korea, Japan). Synonym: Allocosmia Sugi (type species coreana), praeocc. Species of this genus are somewhat similar in facies to those of Dyrzela and Calymniops, but the forewings are brown or grey. The dark subapical patch on the costa is always large, and there are sometimes smaller ones within the submarginal, particularly subdorsally. The fasciae are paler than the ground rather than darker, and the postmedial is strongly angled distal to the large reniform, which, with an orbicular half its size, is conspicuously defined by a pale boundary similar to the fasciae. In the male abdomen, the eighth segment (megastigmata Hampson) has the anterior corners of the sternite produced, and there is a small corema centrally just interior from the posterior margin. The tergite is paddle-like, somewhat as in Brevipecten and Ramadasa, the anterior ‘handle’ terminating in short, robust, outcurved apodemes as illustrated. The genitalia within the genus generally have the base of the uncus expanded into a plate that has a tuft of hairs dorsally. The valves are somewhat parallel‑sided, though rounded basally and apically, and the costa is adjacent to the tegumen. There is an interiorly directed process at the centre of the costa, and the sacculus terminates in a harpe that is oriented in the same direction as the costal process. The aedeagus vesica has a large cornutus in the Sundanian species but not in the type species. The female genitalia have the ostium set in a broad pocket anterior to the ventral gap in the ring of the eight segment. The ductus bursae is narrow, fluted as long as the seventh segment. The corpus bursae is irregularly pyriform, with complex corrugation in the basal part. There is no signum. The genus contains two further species in east Asia and one in Taiwan (Kobes, 1984, Heterocera Sumatrana 2: 29, from Sugi in Inoue et al., 1982; Sugi & Sasaki, 2001). Holloway (1998, 2005: 199) added the Indian Subregion species megastigmata Hampson, which has larval characteristics that indicate that the genus should be placed in the Bagisarinae, a placement supported by Sugi & Sasaki (2001); this species proves to be conspecific with sugii Kobes (see below). Holloway (1998) also suggested that the Chinese apicalis Leech, placed in Oglasa Walker by Poole (1989), was congeneric. Sugi & Sasaki (2001) confirmed this. The larva of the type species was described and illustrated by Sugi & Sasaki (2001). It is very similar to that of the Bornean species as described below. The anal prolegs are long with broad plantae, and held in a splayed position posterior to the anal segment. The first instar is pale green with prominent black primary setae giving it a bristly appearance. These setae are pale in later instars. The host plant was Tilia. The host plants recorded for the genus (see also Robinson et al., 2001 and below) are species of Sterculia (Sterculiaceae) and Tilia (Tiliaceae).
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