Dicerca tenebrica, the flatheaded wood borer[1] or flatheaded poplar borer,[2] is a brassy to black coloured[3] beetle from Chrysochroinae subfamily which can be found in Canada and both Southern[4] and Northeastern United States.

Its prothorax have lateral margins which are parallel at base and expanded closer to the middle.

The lateral margins which are closer to elytron are subparallel and are wide farther from the middle.

[5] Females of the D. tenebrica are different from the rest of the genus due to reduced middle tooth or it complete absence off.

In Alberta, it is known for feeding on Pinus contorta, aspens, jack pines, and white spruces[6] in which they also lay their eggs.