"brachyta interrogationis" can reach approximately a body length of . they have a black body. pronotum is convex, with dense punctuation. also head, thorax and legs are black. legs are relatively long and slender. the elytra are characterized by a very high variability and more than 150 varietas have been described. sometimes the elitra are completely black or completely yellow, but usually they are brownish-yellow, with black spots on scutellum, two longitudinal black arcuate bands, and black spots on the sides and on the apex. antennae are composed by 5-11 segments.