Microperus perparvus (Sampson, 1922)

Smith, Sarah M., Beaver, Roger A. & Cognato, Anthony I., 2020, A monograph of the Xyleborini (Coleoptera, Curculionidae, Scolytinae) of the Indochinese Peninsula (except Malaysia) and China, ZooKeys 983, pp. 1-442 : 1

Microperus perparvus (Sampson, 1922) Fig. 69A, B, I

Xyleborus perparvus Sampson, 1922b: 151.

Microperus perparvus (Sampson): Maiti and Saha 1986: 97.

Coptodryas perparva (Sampson): Wood and Bright 1992: 826.

Xyleborus tsukubanus Murayama, 1954: 184. Synonymy: Beaver et al. 2008: 233.

Type material.

Syntypes Xyleborus perparvus (NHMUK).

New records.

China: Hong Kong, Tai Po Kau, vi.2017, J. Skelton (MSUC, 1). Jiangxi, Long Nan, 10.vii.2016, Lv-Jia, Lai, S-C., ex Eriobotrya japonica (RABC, 1). Sichuan, Mt. Emei, 18.viii.2016, Tian-Shang (RABC, 1). S Yunnan, Xishuangbanna, 20 km NW Jinghong, vic. Man Dian (NNNR), 22°07.80'N, 100°40.05'E, 740 m, fallow, 18.vi.2008, A. Weigel (RABC, 1); as previous except: forest, 28.vi.2008 (RABC, 1); as previous except: 730 m, forest, EKL, 6.iv.2009, L. Meng (RABC, 6); as previous except: 23 km NW Jinghong, vic. Na Ban (NNNR), 22°09.49'N, 100°39.92'E, rubber plantation, 730 m, 15.vi.2008, A. Weigel (RABC, 2); as previous except: 25 km NW Jinghong, vic. Zhang Zhi Chang (NNNR), 22°11.06'N, 100°39.05'E, 780 m, rubber plantation, EKL, 15.vi.2008, A. Weigel (RABC, 2). Vietnam: Cao Bang, 22°36.454'N, 105°52.083'E, 1661 m, 15.iv.2014, VN38, Cognato, Smith, Pham, ex 1-3 cm diameter branch and twig (MSUC, 2). Dong Nai, Cat Tien N.P., 11.40817, 107.38098, 134 m, 22-24.ii.2017, VN81, A.I. Cognato, T.A. Hoang, ex FIT (MSUC, 1).

Diagnosis.

1.5-1.9 mm long (mean = 1.64 mm; n = 5); 2.71-2.86 × as long as wide. This species is distinguished by the elytral disc flat with short and steep obliquely truncate declivity; posterolateral carina weak, denticulate; declivital interstriae straight from base to apex, never laterally broadened; denticles on declivital summit denser and of equal size to those on declivital face; declivital face shagreened, dull.

Similar species.

Microperus kirishimanus , M. latesalebrinus , M. nudibrevis .

Distribution.

Bangladesh, China (Fujian, Guizhou, Hong Kong*, Hunan, Jiangxi*, Sichuan*, Xizang, Yunnan*), India (Andaman Is, Assam, West Bengal), Indonesia (Ternate), Japan, East & West Malaysia, Myanmar, New Guinea, Solomon Islands, Taiwan, Thailand, Vietnam*.

Host plants.

Polyphagous, possibly with some preference for Dipterocarpaceae ( Beaver and Liu 2010).

Figures

Figure 69. Dorsal, lateral and declivital view of Microperus perparvus, 1.5 - 1.9 mm (A, B, I), M. pometianus, 1.2 - 1.7 mm (C, D, J), M. quercicola, 1.8 - 2.0 mm (E, F, K), and M. recidens, 1.9 - 2.0 mm (G, H, L).