Common NameHemlock engraver.
SeasonalityAdult S. tsugae may usually present from May to early September, with peak activity late June and July (McMullen & Atkins 1959, Bright 1976).
IdentificationThe adults of these beetles may be 2.8 to 3.5 m long, with a black body (Bright 1976). In males, the frons is generally flat or slightly convex with course articulation. Females, on the other hand, have frons that is convex with finer articulation (Bright 1976).