Cyclorhipidion japonicum (Nobuchi, 1981) Fig. 42C, D, J

Xyleborus japonicus Nobuchi, 1981a: 153.

Cyclorhipidion japonicum (Nobuchi): Smith et al. 2018b: 394.

Type material.

Holotype (NIAES).

New records.

China: [unspecificed province], northeastern China, DB07, A56, Wang (RJRC, 1). S. Yunnan, Xishuangbanna, 28 km NW Jinghong, vic. An Ma Xi Zhan (NNNR), 22°12'N, 100°38'E, 700 m, forest, 25.iii.2009, L. Meng (RABC, 1); as previous except: 23 km NW Jinghong, vic. Na Ban (NNNR), 22°09.49'N, 100°39.92'E, 730 m, rubber plantation, 15.vi.2008, A. Weigel (RABC, 1). Thailand: Chiang Mai, Doi Pui, 1400 m, 18-22.x.2004, W. Puranasakul, ex EtOH trap (RABC, 2); as previous except: 6-27.vi.2005 (RABC, 1). [Chaiyaphum], Phu Khieo N.P., branch, vii.2005, Hulcr et al. (RABC, 1).

Diagnosis.

2.1-2.3 mm long (mean = 2.2 mm; n = 4); 2.81-3.5 × as long as wide. This species is distinguished by the small size; declivity obliquely truncate, moderately to strongly sulcate; pronotum elongate from dorsal view (type 9); declivity laterally sulcate to interstriae 3, interstriae 3 bearing five tubercles along its length.

Similar species.

Cyclorhipidion neocavipenne, C. xeniolum .

Distribution.

China* (Yunnan), Japan, Russia (Far East), South Korea, Thailand*.

Host plants.

Recorded only from Castanopsis and Quercus ( Fagaceae) (Nobuchi 1981a).