Cephalispa triquetra sp. nov.

(Figs 13‒18, 30)

Description. Very similar to C. xanthogaster comb. nov. in general appearance, but differing from it as follows: Male 5th abdominal sternite (Figs 13‒14) nearly straight apically in lateral view.

Male terminalia (Figs 15‒18). Surstylus broad and nearly triangular on apical 3/ 5 in lateral view, nearly straight and curved inward at apex in dorsal view; postgonite with middle part curved ventrally, dorsal part hooklike and curved dorsally at apex; phallus long, strongly curved ventrally at apical 1/4, hook in shape apically with membranous areas laterally and apically in lateral view, bifurcated apically in dorsal view.

Female. Unknown.

Body length. 5.5‒6.2 mm (n = 2).

Type material examined. Holotype: Male, Nishimata-dani valley, Kashimo, Nakatsugawa city, Gifu pref., Japan [Alt. 800m], 7. VIII. 2015, D. Katō (BLKU). Paratypes: JAPAN: One male, Mt. Sefuri, Fukuoka city, Fukuoka pref., 4. VII. 1976, K. Ohara (BLKU); 1 male, Ogawachi, Higashi-sefuri Vil., Kanzaki-gun, Saga pref., 30. VI. 2000, T. Tachi (BLKU).

Distribution. Japan (Honshu, Kyushu).

Bionomics. Unknown.

Etymology. The specific epithet refers to the shape of male surstylus.

Remarks. This species resembles C. fani Cui & Xue, 1995 from China, C. okinawaensis sp. nov. and C. xanthogaster (Shinonaga) comb. nov. It is distinguishable from them by the strongly curved postgonite and phallus (Fig. 17).