Xylosandrus eupatorii (Eggers, 1940)

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

Xylosandrus eupatorii (Eggers, 1940) Fig. 95A, B, I

Xyleborus eupatorii Eggers, 1940: 140.

Xylosandrus eupatorii (Eggers): Schedl 1964c: 213.

Type material.

Paratypes (NMNH, 2).

New records.

China: Hainan, Wu-zhi-shan Town, 18.902N, 109.663E, 703 m, 2.xii.2016, Tian-Shang, Lv-Jia (RABC, 2). Hong Kong, Tai Po Kau, vi.2017, J. Skelton (UFFE, 1). Vietnam: Cao Bang, 22°36.804'N, 105°51.982'E, 1831 m, 17.iv.2014, VN42, Cognato, Smith, Pham, ex 0.3-3 cm twigs/branches (MSUC, 1); 22°33.9981'N, 105°52.591'E, 1051 m, 12-17.iv.2014, VN11, Cognato, Smith, Pham, ex FIT (MSUC, 26). Lao Cai, Hoang Lien N.P., 22.35, 103.77, 1500-2000 m, 20.v.2019, VN185, S.M. Smith, A.I. Cognato, ex 1-2 cm branch (MSUC, 2). Thua Thien-Hue, Bach Ma N.P., 16.19718, 107.86002, 1409 m, 14.ii.2017, VN51, A.I. Cognato, T.A. Hoang, ex top half of tree, 10 cm diameter branches (MSUC, 12).

Diagnosis.

2.0-2.3 mm long (mean = 2.12 mm; n = 5); 2.22-2.3 × as long as wide. This species is distinguished by its moderate size; elytral disc gradually curving toward declivity, elytra rounded; posterolateral margins of elytra carinate to interstriae 7; declivital face with six punctate striae; declivital interstriae uniseriate granulate, with erect hair-like setae longer than the width of two interstriae; pronotum as long as wide, pronotum from dorsal view rounded (type 1) and lateral view basic (type 0), summit at midpoint, basal 1/2 smooth, shiny, sparsely minutely punctate; and sparse mycangial tuft on the pronotal base.

This species is nearly identical to X. germanus and is most readily distinguished by the pronotum that is as long as wide; and pronotum base with sparser more dispersed setae.

Similar species.

Xylosandrus dentipennis , X. germanus , X. metagermanus .

Distribution.

China (Hainan, Hong Kong*, Yunnan), Indonesia (Java), Thailand, Vietnam*.

Host plants.

Recorded only from Eupatorium ( Asteraceae ) ( Eggers 1940).

Figures

Figure 95. Dorsal, lateral and declivital view of Xylosandrus eupatorii, 2.0 - 2.3 mm (A, B, I), X. formosae, 2.5 - 3.0 mm (C, D, J), X. germanus, 2.3 - 2.4 mm (E, F, K), and X. jaintianus holotype, 3.0 mm (G, H, L).