Abstract
A key is given to the species of Aphis L. on Ribes spp. in North America, including, A. bulleri new species and A. manitobensis new species. A. ribigillettei Knowlton and Allen and A. sanborni Patch are declared to be synonyms of A. neomexicana Cockerell, and A. tonahasa Hottes is considered to be a nomen dubium.

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