Size: 4-4.5mm
Basic colour: Head black, pronotum normally uniformally bright red-brown. Elytra black with basal third, suture and margins red brown.
Pronotoum: Transverse, sides strongly rounded and hind angles indistinct; foveae almost impunctate.
Leg colour: Brown.
Confusion species: Acupalpus flavicollis
, Confusion species: Acupalpus parvulus

Size: 2.5-2.8mm
Basic colour: Pale to mid-reddish brown.
Pattern colour: Pronotum paler than head and much of the elytra.
Pronotoum: Widest well in front of the middle. Sides almost straight behind this, hind angles rounded but distinct; foveae almost impunctate.
Leg colour: Yellow or pale brown.
Confusion species: Acupalpus exiguus
, Confusion species: Acupalpus flavicollis

Size: 17-22mm
Basic colour: Shining black.
Pronotoum: Widest in front of middle, sides behind this almost straight and converging to sharp rectangular hind angles. Hind margin concave, foveae double, linear and unpunctured.
Leg colour: Black.