Lasconotus okadai Aoki, 2011

(Figs 2 and 6)

Bitoma niponia (not of Lewis, 1879): Sasaji 1985: 292, pl. 48, fig. 1.

Lasconotus niponius (not of Lewis, 1879): Aoki 2009a: 124, fig. (p. 125) (in part).

Lasconotus okadai Aoki, 2011: 99, figs 3, 4; Aoki 2012: 45, fig. 33, 33A, 33B; 2013a: 109, fig. 30; 2013b: 75, fig. 2-37C and D.

Material examined. 1 ex . (JAC-5), Institute of Nature Study, Shirokane-dai, Minato-ku, Tokyo, Japan, 17 May 2012, J . Aoki leg . 1 ex . (JAC-6), Sôgawa-mura, Gihu Prefecture, Japan, 22 June 2003, N . Kanie leg . 1 ex . (JAC-7), Imperial Palace, Tokyo, Japan, 18 May 2011, J . Aoki leg . 1 ex. ♂ (JAC-8, dissected and mounted on slides), the same place to JAC-7, 22 July 2010, J . Aoki leg .; 1 ex . ♂ (JAC-9, dissected and mounted on slides), Tôno-sawa, Hakone-machi, Kanagawa Prefecture, Japan, 29 March 2010, J . Aoki leg .

Diagnosis. Body black, mat, 2.35–2.90 mm in length; pronotum length 0.63–0.77 mm; pronotum width 0.70– 0.78 mm; elytral length 1.70–1.88 mm; elytral width 0.70– 0.80 mm; PW/PL 1.01–1.07; EW/PW 1.00–1.03; EL/EW 2.27–2.43; EL/PL 2.53–2.76. Terminal club of antenna consisting of three segments almost equal in size; third segment longer than fourth one (Fig. 2). Anterior angles of pronotum usually produced, but not so prominently and sometimes rounded; among four longitudinal carinae on pronotum, two admedian ones broad and dull; elytral ridges strong, ridges 3 and 4 joined together before reaching elytral edge. Sculpture on metasternum wholly developed; sculpture on ventrites amoeba-like, irregularly connecting one another (Fig. 6).

Distribution. Japan: Hokkaido, Honshu and Kyushu.