Key to the Dolichoderus thoracicus species-group in Thailand

Key to the Dolichoderus thoracicus species-group in Thailand, based on Barabag & Jaitrong (2022).

1

 * Head densely and finely rugulose or punctured; dorsa of head, mesosoma, and gaster with dense pubescence and standing hairs; larger species (HW ˃ 0.90 mm)
 * Head superficially reticulate or smooth and shiny; dorsa of head, mesosoma, and gaster with sparse pubescence and standing hairs; smaller species (HW ˂ 0.80 mm)

2

 * Propodeal junction sharply angulated; dorsal outline of propodeum almost straight Dolichoderus affinis
 * Propodeal junction bluntly angulated; dorsal outline of propodeum convex Dolichoderus thoracicus

3

 * Mesosoma foveolate
 * Mesosoma punctured, not foveolate

4

 * Propodeal junction sharply angulated; dorsal outline of propodeum straight; pronotum flat Dolichoderus butteli
 * Propodeal junction bluntly angulated; dorsal outline of propodeum convex; pronotum convex Dolichoderus brevis

5

 * Larger species (TL 3.14–3.63 mm, HL 0.73–0.79 mm, HW 0.6–0.76 mm); head slightly longer than broad; body entirely yellowish-brown; dorsal outline of propodeum weakly convex; lateral face of pronotum relatively smooth with more developed of frontal carinae Dolichoderus bakhtiari
 * Smaller in size (TL 2.51–2.93 mm, HL 0.66–0.69 mm, HW 0.49–0.52 mm); head slightly shorter than broad; vertex of head and gaster dark brown; dorsal outline of propodeum straight; lateral face of pronotum punctate with less developed of frontal carinae Dolichoderus taprobanae