Euwallacea minutus (Blandford, 1894)

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

Euwallacea minutus (Blandford, 1894) Fig. 56G, H, L

Xyleborus minutus Blandford, 1894b: 116.

Planiculus minutus (Blandford): Beaver and Liu 2010: 29.

Wallacellus minutus (Blandford): Beaver et al. 2014: 61.

Euwallacea minutus (Blandford): Storer et al. 2015: 395.

Xyleborus breviusculus Schedl, 1942a: 196. Synonymy: Schedl 1958c: 147.

Xyleborus pernitidus Schedl, 1954a: 152. Synonymy: Schedl 1958c: 147.

Type material.

Syntypes Xyleborus minutus (NHMUK).

New records.

China: Jiangxi, Xunwu, Xingshan, 6.ix.2018, Y. Li, ex Fagaceae log (UFFE, 1). Laos: Vientiane, Ban Van Eue, 15.viii.1966, native collector (BPBM, 1). Philippines: Calmarines Norte, Mount Labo, Basecamp, 14°04.546'N, 122°46.146'E, 237 m, 5.vi.2016, Siler Brachymeies Expedition 2, ex pan traps, Department of Recent Invertebrates OMNH-66417 (OMNH, 1). Vietnam: Cao Bang, 22°34.118'N, 105°52.537'E, 1048 m, 12-17.iv.2014, VN9, Cognato, Smith, Pham, ex FIT (MSUC, 1). Thua Thien-Hue, Bach Ma N.P., 16.22897, 107.85349, 415 m, 15.ii.2017, VN60, A.I. Cognato, T.A. Hoang, ex 4 cm diameter branch (MSUC, 2).

Diagnosis.

1.8-1.9 mm long (mean = 1.87 mm; n = 3); 2.57-2.71 × as long as wide. This species is distinguished by its minute size; short, steep declivity with two transverse rows of granules on each interstriae at declivital summit; pronotum from dorsal view elongate (type 7); and pronotal asperities small, coarse.

Similar species.

Euwallacea semiermis .

Distribution.

Brunei, China (Chongqing, Jiangxi*, Yunnan), Indonesia (Java), Japan, Korea, Laos, East & West Malaysia, Philippines*, Solomon Islands, Taiwan, Thailand, Vietnam*.

Host plants.

Polyphagous ( Browne 1961b; Beaver and Browne 1979; Choo and Woo 1985).

Figures

Figure 56. Dorsal, lateral and declivital view of Euwallacea kuroshio, 2.4 - 2.8 mm (A, B, I), E. luctuosus holotype, 3.6 mm (C, D, J), E. malloti, 2.4 - 3.0 mm (E, F, K), and E. minutus, 1.8 - 1.9 mm (G, H, L).