Appearance
''D. tenebrica'' have a flat head , while its vertex is slightly impressed from the middle. Both disk and vertex are coarsed and punctated. 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.Females of the ''D. tenebrica'' are different from the rest of the genus due to reduced middle tooth or it complete absence off. Males are 15–21.5 millimetres long and are 4.8–7.2 millimetres wide while females' length can range from 14.5–26 millimetres with width being from 4.5–9.0 millimetres .
Habitat
The species flies from March to November during which months it feeds on poplar species (especially ''Populus balsamifera''. In Alberta, it is known for feeding on ''Pinus contorta'', aspens, jack pines, and white spruces in which they also lay their eggs.References:
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