Taxonomic history

Xyleborus tristis Eggers, 1930: 194

Euwallacea tristis (Eggers): Wood and Bright, 1992: 694.

Heteroborips tristis (Eggers): Smith et al., 2020b: 276.


3.9−4.0 mm long (mean = 3.92 mm; n = 3); 2.79−3.25 times as long as wide. This species can be recognized by the distinctive elytral mycangium appearing as a distinctly impressed area immediately adjacent to the scutellum on each elytron which are distinctly raised along the apical margin; large size, pronotum from dorsal view appearing subquadrate (type 3); elytral declivity steeply sloping, occupying third quarter of elytra; and elytral disc flat and transverse.

May be confused with

Euwallacea luctuosus, E. sibsagaricus, and E. subalpinus


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

Host plants

recorded from Vatica (Dipterocarpaceae) and Macaranga (Euphorbiaceae) (Maiti and Saha 2004)

DNA data

specimens not available for sequencing