Heteroborips tristis

Taxonomic history

Xyleborus tristis Eggers, 1930: 194

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

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

Diagnosis

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 elytralelytral:
pertaining to the elytra
mycangium appearing as a distinctly impressedimpressed:
a depression in a surface
area immediately adjacent to the scutellumscutellum:
a shield-like sclerotized plate located at the midpoint of the elytral base 
on each elytronelytron:
the two sclerotized forewings of beetles that protect and cover the flight wings
which are distinctly raised along the apicalapex:
point or edge furthest from the body; opposite of base
margin; large size, pronotumpronotum:
the dorsal surface of the thorax
from dorsaldorsal:
of or relating to the upper surface; opposite of ventral
view appearing subquadratesubquadrate:
almost quadrate, with oblique corners
(type 3); elytralelytral:
pertaining to the elytra
declivitydeclivity:
downward slope of either the pronotum or elytra
steeply sloping, occupying third quarter of elytra; and elytralelytral:
pertaining to the elytra
discdisc:
the flat central upper surface of any body part (e.g. pronotum and elytra)
flat and transverse.

May be confused with

Euwallacea luctuosus, E. sibsagaricus, and E. subalpinus

Distribution

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

Host plants

recorded from Vatica (Dipterocarpaceae) and Macaranga (Euphorbiaceae) (Maiti and Saha 2004Maiti and Saha 2004:
Maiti PK, Saha N. 2004. Fauna of India and the adjacent countries. Scolytidae: Coleoptera (bark and ambrosia beetles). Vol. 1. Part 1. Zoological Survey of India, Kolkata, 268 pp.)

DNA data

specimens not available for sequencing