Microperus quercicola (Eggers, 1926)

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 quercicola (Eggers, 1926) Fig. 69E, F, K

Xyleborus quercicola Eggers, 1926: 146.

Microperus quercicola (Eggers): Smith et al. 2018b: 396.

Xyleborus izuensis Murayama, 1952: 16. Synonymy: Smith et al. 2018b: 396.

Type material.

Holotype Xyleborus quercicola (NMNH).

New records.

China: Guizhou, Zunyi, 28.x.2015, Y. Li, ex Cinnamomum camphora (MSUC, 5). Hong Kong, Tai Po Kau, vi.2017, J. Skelton, ex Lauraceae (MSUC, 1). Jiangxi, Nanchang, 12.iii.2018, Y. Li (UFFE, 1). Sichuan, Chengdu, 570 m; 8.vi.1960, Huifen Yin, Cinnamomum 78 (NMNH, 1). Zhejiang, Fuyang, 11.iv.1984, Guangpu Shen, Cinnamomum sp. (NMNH, 2). Taiwan: Nantou, Huisun, 24.x.2017, Y-T Huang, J. Hulcr, ex Diospyros morrisiana (MSUC, 1); as previous except: Zhushan, 11.vii.2017, C.-S. Lin (MSUC, 1).

Diagnosis.

1.8-2.0 mm long (mean = 1.96 mm; n = 5); 2.38-2.86 × as long as wide. This species is distinguished by the elytral disc flat; declivity short, steep; declivity granulate from base to apex, granules small, as abundant as strial punctures; granules dense, separated by the width of one granule; declivital surface shiny; posterolateral costa strongly carinate; interstriae densely setose, setae fine, hair-like as long as the width of an interstria; and strial punctures setose, setae recumbent, hair-like, less than a strial width.

Similar species.

Microperus kadoyamaensis , M. pometianus .

Distribution.

China* (Guizhou, Hong Kong*, Jiangxi, Sichuan, Zhejiang), Japan, Russia (Far East), South Korea, Taiwan*.

Host plants.

This species is polyphagous and has been recorded from Cinnamomum ( Lauraceae ) ( Murayama 1952), Diospyros ( Ebenaceae ), Fraxinus ( Oleaceae ), Carpinus ( Betulaceae ) ( Mandelshtam et al. 2018) and "oak trees" ( Fagaceae ) ( Eggers 1926).

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).