Heteroborips tristis (Eggers, 1930) Smith & Beaver & Cognato, 2020

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

Heteroborips tristis (Eggers, 1930) comb. nov. Fig. 63G, H, L

Xyleborus tristis Eggers, 1930: 194.

Euwallacea tristis (Eggers): Wood and Bright 1992: 694; Smith et al. 2018a: 138.

Type material.

Neotype (NHMB).

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). Meghalaya, 3 km E Tura, 25°30'N, 90°14'E, 1150 m, 4.v.1999, Dombický & Pacholátko (NHMB, 1; RABC, 1).

Diagnosis.

3.9-4.0 mm long (mean = 3.92 mm; n = 3); 2.79-3.25 × as long as wide. This species can be recognized by the unique elytral mycangium appearing as a distinct impressed area immediately adjacent to the scutellum on each elytron, its posterior margin distinctly raised; large size, pronotum from dorsal view appearing subquadrate (type 3); declivity steeply sloping, occupying apical 3/4 of elytra; and elytral disc flat and transverse.

Similar species.

Euwallacea luctuosus , E. sibsagaricus , E. subalpinus .

Distribution.

India (Arunachal Pradesh*, Assam, Meghalaya, West Bengal).

Host plants.

Recorded from Vatica ( Dipterocarpaceae ) and Macaranga ( Euphorbiaceae ) ( Maiti and Saha 2004).

Remarks.

Xyleborus tristis is here transferred to Heteroborips because of the distinct elytral mycangia adjacent to the scutellum on each elytron.

Figures

Figure 63. Dorsal, lateral and declivital view of Heteroborips fastigatus holotype, 3.4 - 3.5 mm (A, B, I), H. indicus holotype, 2.2 - 2.4 mm (C, D, J), H. seriatus, 2.5 - 2.9 mm (E, F, K), and H. tristis, 3.9 - 4.0 mm (G, H, L).