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Length 12-16 mm (Linsley and Chemsak 1972). The head is black (Say 1859) and small, gradually converged behind eyes (Linsley and Chemsak 1972). The eyes are faceted or with a smooth polish and emarginate or notched (Linsley and Chemsak 1972). The antennae are rufous in color with prominent tubercles (Linsley and Chemsak 1972) and are shorter than the elytra. The third antennal segment is shorter than the fourth. The fifth antennal segment is equal in length to the third (Linsley and Chemsak 1972). The thorax has uneven anterior and posterior impressed bands and a dorsal impressed line (Say 1859). The elytra are black with parallel broad lateral yellow vittae or stripes that do not reach the tip (Linsley and Chemsak 1972). The margins of the elytra are rufous in color and separated from the vitta by a black line near the base and the humerus is prominent (LeConte 1859). The body is black ventrally with golden pubescence (Say 1859). The legs are rufous or yellow in color (Hopping 1937).

All cerambycids are phytophagous and most Lepturinae larvae are wood borers (Triplehorn and Johnson 2005). There is no literature that directly indicates that S. trivittatus is a flower dwelling species. However if S. vittiger is accepted as a synonym of S. trivittatus then host flowers include Vibernum, Hydrangea, Spiraea, Crataegus, Cornus, and Nyssa (Linsley and Chemsak 1972).

The type locality is the Mississippi valley (Hopping 1937). Specimens have also been recorded from Alberta, Manitoba, Missouri, Wyoming, New York, Pennsylvania, Maine and Illinois (Aurivillius 1912; Hopping 1937; Leng 1890; Linsley and Chemsak 1972).