Cephalispa kudoi sp. nov.

(Figs 1‒6, 25, 28, 30)

Description. Male and female.

Head. First flagellomere cream yellow in basal 1/3 and yellowish brown in apical 2/3; palpus cream yellow; labella yellow. Gena 0.09‒0.11 of eye height.

Thorax. Anterior and posterior spiracles yellow. Two‒three postsutural intra-alar setae.

Abdomen. Whitish yellow in ground color with blackish brown pruinosity medially. Male 5th sternite (Figs 1‒2) nearly rectangular in ventral view, round and curved ventrally at posterior apex in lateral view with large ridge internally.

Male terminalia (Figs 3‒6). Surstylus nearly straight and pointed apically with some setae on entire length in lateral view, slightly narrow at middle in dorsal view; bacilliform sclerite strongly reduced; hypandrium nearly triangular in lateral view; postgonite broad, curved ventrally at middle and pointed at apex; phallus nearly straight, strongly notched at middle, hook-like apically in lateral view, asymmetric at apical half with membranous area in dorsal view.

Female terminalia (Fig. 25). Seventh sternite strongly reduced.

Body length. 5.5‒7.0 mm (n = 53).

Type material examined. Holotype: Male, Onoaida, Yakushima town, Yakushima Is., Kumage-gun, Kagoshima pref., Japan [N 30°14’39” / E 130°33’30”], 9. III. 2013, S. Yoshizawa (BLKU). Paratypes: JAPAN: Five males and 27 females, same data as holotype (BLKU); 1 male and 7 females, same locality and collector as holotype, 7. III. 2013 (BLKU); 1 female, Tenokuchi, Yakushima town, Yakushima Is., Kumage-gun, Kagoshima pref. [N 30°17’29” / E 130°37’34”], 4. VI. 2015, S. Yoshizawa (BLKU); 2 males and 2 females, Mt. Higo, Sumiyo town, Amami city, Amami-ōshima Is., Kagoshima pref. [N 28°12’47” / E 129°22’49”], 4. VII. 2013, S. Yoshizawa (BLKU); 1 female, Mt. Yonaha, Azaokuma, Kunigami Vil., Kunigami-gun, Okinawa Is., Okinawa pref., 8. IV. 1953, T. Shiraki (NIAES); 1 male, Inoda, Ishigaki city, Ishigakijima Is., Okinawa pref., 27. II. 1953, T. Shiraki (NIAES); 1 male and 2 females, Siramizu, Ishigaki city, Ishigakijima Is., Okinawa pref. [N 24°25’19” / E 124°9’50”], 31. V. 2012, S. Yoshizawa (BLKU); 1 male and 1 female, Urauchi river, Urauchi, Taketomi town, Iriomotejima Is., Yaeyama-gun, Okinawa pref. [N 24°24’15” / E 123°46’56”], 22. VI. 2011, S. Yoshizawa (BLKU); 1 female, Urauchi, Taketomi town, Iriomotejima Is., Yaeyama-gun, Okinawa pref. [N 24°24’10” / E 123°46’42”], 24. V. 2012, S. Yoshizawa (BLKU).

Distribution. Japan (Yakushima Is., Amami-Oshima Is., Okinawa Is., Ishigakijima Is., Iriomotejima Is.).

Bionomics. This is a forest-inhabiting species.

Etymology. The specific epithet is taken from Mr. Yuta Kudo, who supported us for material collecting in Yakushima Is.

Remarks. This species is easily distinguished from the other Japanese species by having the asymmetric phallus and greatly reduced female abdominal 7th sternite (Figs 6, 25). This species is thought to be close to Chinese species, C. curtrata Cui & Xue, 1995 and C. breviabdominis Cui & Xue, 1995 by having the asymmetric phallus (Cui et al., 1995). It is distinguishable from them by the narrowed surstylus at middle in dorsal view (Fig. 4).