| abstract | Adults of four new species of Trisetacus are described from southern British Columbia, Canada: T. neoabietis from foliage of Amabilis fir, T. neopiceae from foliage of Engelmann and Sitka spruce, T. uclueletensis from foliage of Sitka spruce, and T. columbiensis from buds and foliage of Douglas-fir. |