Nesoclutha concavipenis, sp. nov.

(Figs. 1 A–J)

Description. Body pale yellowish brown; head, pronotum and scutellum immaculate; forewings yellowish with smoky grey markings. Ocelli separated from eyes by twice own diameter. Pronotum approximately 1.5 times as long as vertex (Fig. 1 A).

Male genitalia. Aedeagus with shaft short, base broad, deeply concave ventrally in lateral view; subapex expanded, gradually tapering; apex short and acute, without processes (Fig. 1 I).

Measurement. Length (including tegmen). Male: 2.7 mm.

Type. Holotype: ɗ, China, Hainan Prov., Yacheng, 2173m, 14.v.1983, Coll. Zhang Yalin (NWAFU).

Remarks. The species is similar to N. erythrocephala but can be distinguished from the latter by the shaft of the aedeagus being more deeply concave at midlength ventrally (Fig. 1 H, K). Although we have only seen one specimen this difference is considered of sufficient magnitude to warrant description of the new species.

Etymology. The species epithet “ concavipenis ” refers to the deeply concave ventral margin of the aedeagus.