| abstract | Eriophyes inaequalis, E. burtsi, E. quercichrysolepis, Aceria atriplicis, A. neocondaliae, A. franseriae, A. douglasiana, and Heterotergum schlingeri are described and illustrated, as also is a variant referred to Aceria parapopuli Keifer. Lists are given of the eriophyid species known from Populus in North America and Europe. |