Euwallacea piceus (Motschulsky, 1863)

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 piceus (Motschulsky, 1863) Fig. 57E, F, K

Anodius piceus Motschulsky, 1863: 512.

Euwallacea piceus (Motschulsky): Wood and Bright 1992: 692.

Wallacellus piceus (Motschulsky): Hulcr and Cognato 2010a: 29.

Euwallacea piceus (Motschulsky): Storer et al. 2015: 396.

Xyleborus indicus Eichhoff, 1878a: 392. Synonymy: Wood 1969: 117.

Xyleborus imitans Eggers, 1927a: 404. Synonymy: Wood 1969: 117.

Xyleborus indicus subcoriaceus Eggers, 1927b: 92. Synonymy: Schedl 1959: 504.

Xyleborus samoensis Beeson, 1929: 237. Synonymy: Wood 1960: 63.

Type material.

Lectotype Xyleborus imitans (NMNH). Holotype Xyleborus samoensis (NHMUK), paratype (FRI).

New records.

India: Arunachal Pradesh, Etalin vicinity, 28°36'56"N, 95°53'21"E, 700 m, 12-25.v.2012, L. Dembický (ZFMK, 2). Assam, Bhalukpong, 27°02'N, 92°35'E, 150 m, 26.v-3.vi.2006, L. Dombický (NHMUK, 1). Meghalaya, Nokrek N.P., 3 km S Darbokgiri, 25°27'N, 90°19'E, 1400 m, 26.iv.1999, Dombický, Pacholátko (RABC, 1). Laos: Vientiane, Ban Van Eue, 31.xi.1965, native collector (BPBM, 1); same as previous except 30.xi.1966 (BPBM, 1).

Diagnosis.

2.2-2.6 mm long (mean = 2.36 mm; n = 5); 2.75-3.25 × as long as wide. This species is distinguished by declivital interstriae parallel, granulate, granules uniform in size; small body size, elongate form; declivital striae 1 not impressed; elytral apex entire; and dark brown to black color.

Similar species.

Euwallacea similis , Planiculus spp.

Distribution.

Throughout the Oriental region from the Indian subcontinent through Southeast Asia, Indonesia to New Guinea and the Western Pacific islands; tropical Africa, Madagascar and the Seychelles. Recorded in the study region from Bangladesh, India (Andaman Is, Arunachal Pradesh*, Assam*, Meghalaya*, Nicobar Is, West Bengal), Laos, Myanmar, Taiwan, Thailand, Vietnam.

Host plants.

Polyphagous ( Browne 1961b; Schedl 1963a).

Remarks.

The species has some potential as a pest because of its deeply penetrating galleries and very wide host range ( Browne 1961a; Schedl 1963a).

Figures

Figure 57. Dorsal, lateral and declivital view of Euwallacea neptis holotype, 4.2 mm (A, B, I), E. perbrevis, 2.3 - 2.5 mm (C, D, J), E. piceus, 2.2 - 2.6 mm (E, F, K), and E. semiermis lectotype, 2.5 - 2.75 mm (G, H, L).