Euwallacea validus (Eichhoff, 1876)

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 validus (Eichhoff, 1876) Fig. 59C, D, H

Xyleborus validus Eichhoff, 1876a: 202.

Euwallacea validus (Eichhoff): Wood and Bright 1992: 694.

Type material.

Syntype (IRSNB).

New records.

China: Chongqing, Youyang, 11.vii.2016, Tian-Shang (RABC, 1). W. Hupeh [= Hubei], Lichuan Distr., Suisapa, 1000 m, 29.vii.[19]48, Gressitt & Djou, ex Metasequoia glyptostroboides (CASC, 4). Fujian, Jiangle, Longqishan Mt., 700 m, 7.viii.1991, Xiaochun Zhang coll, ex pine (BPBM, 1); as previous except: 26[?].v.1991, Hong Liu (BPBM, 1).

Diagnosis.

3.9-4.1 mm long (mean = 4.0 mm; n = 5); 2.5-2.73 × as long as wide. This species is distinguished by the pronotum appearing subquadrate (type 3) from dorsal view; outer margin of protibiae round, declivital interstriae 1 granulate; declivital posterolateral margin carinate never granulate; and moderately large size.

It can be further separated from the strongly morphologically similar species E. interjectus by the declivity steeply sloped; declivital strial punctures deep giving the declivity a rugged appearance; and tubercles mostly absent from the apical 1/2 of interstriae 2.

Similar species.

Euwallacea funereus , E. interjectus , E. velatus .

Distribution.

China (Anhui, Chongqing*, Fujian, Hubei*, Yunnan), Japan, Nepal, South Korea, Taiwan, Vietnam. Introduced and established in USA (Wood 1975; Cognato et al. 2015; Gomez et al. 2018a).

Host plants.

Polyphagous attacking both gymnosperm and angiosperm trees ( Wood and Bright 1992).

Figures

Figure 59. Dorsal, lateral and declivital view of Euwallacea testudinatus paratype, 2.8 - 2.9 mm (A, B, G), E. validus, 3.9 - 4.1 mm (C, D, H), and E. velatus, 2.8 - 3.6 mm (E, F, I).