Euwallacea velatus (Sampson, 1913)

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 velatus (Sampson, 1913) Fig. 59E, F, I

Xyleborus velatus Sampson, 1913: 443.

Euwallacea velatus (Sampson): Wood 1989: 173.

Xyleborus rudis Eggers, 1930: 192. syn. nov.

Xyleborus assamensis Eggers, 1930: 195. Synonymy: Wood 1989: 173.

Xyleborus asperipennis Eggers, 1934b: 27. Unnecessary new name for X. assamensis Eggers, 1930 nec Stebbing, 1909. Synonymy: Wood 1989: 173.

Type material.

Holotype Xyleborus velatus (NHMUK), paratype (NHMW). Holotype Xyleborus assamensis (FRI), paratype (NMNH, 1; NHMW, 1). Paratype Xyleborus rudis (NHMW).

New records.

China: Yunnan, Xishuangbanna, Sanchahe Nat. Res., 22°09.784'N, 100°52.256'E, 2186 m, 29-30.v.2008, A.I. Cognato (MSUC, 1). India: Arunachal Pradesh, Etalin vicinity, 28°36'56"N, 95°53'21"E, 700 m, 12-25.v.2012, L. Dembický (ZFMK, 1). Vietnam: Ninh Binh, Cuc Phuong N.P., 20.33296, 105.61259, 7.iii.2018, 279 m, A.I. Cognato, S.M. Smith, VN 140, ex 3 cm diameter branch (MSUC, 4).

Diagnosis.

2.8-3.6 mm long (mean = 3.28 mm; n = 5); 2.31-2.57 × as long as wide. This species is distinguished by the granulate posterolateral costa, pronotum appearing subquadrate (type 3) when viewed dorsally; protibiae outer margins rounded, bearing nine small socketed denticles, sockets small; declivital posterolateral margin costate and granulate; declivity rounded and convex; and elytral bases rounded, never weakly costate, or granulate.

Similar species.

Euwallacea fornicatus species complex ( E. fornicatior , E. fornicatus , E. kuroshio , E. perbrevis ), E. andamanensis , E. geminus , E. interjectus , E. malloti , E. neptis , E. semirudis , E. testudinatus , E. validus .

Distribution.

China (Xizang, Yunnan*), India (Andaman Is, Arunachal Pradesh*, Assam, Meghalaya, Nagaland, Sikkim, Uttar Pradesh, West Bengal), Laos, Myanmar, Nepal, Thailand, Vietnam*.

Host plants.

Polyphagous ( Maiti and Saha 2004).

Remarks.

Xyleborus rudis was considered a synonym of the African species E. xanthopus by Wood (1989). Examination of the holotype and paratype revealed that this species is clearly conspecific with E. velatus and bears little resemblance to either E. xanthopus or its close Asian relative E. semirudis (Fig. 58A, B, I ). Xyleborus rudis is here placed in synonymy with E. velatus .

Figures

Figure 58. Dorsal, lateral and declivital view of Euwallacea semirudis, 3.1 - 3.3 mm (A, B, I), E. sibsagaricus, 3.4 - 3.9 mm (C, D, J), E. similis, 2.3 - 2.5 mm (E, F, K), and E. subalpinus holotype, 2.4 mm (G, H, L).

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).