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.