The first formal description of the American greenfinch was by the Vietnamese ornithologist Jean Théodore Delacour in 1926 , under the binomial name `` Hypacanthis monguilloti '' .
The first formal description of the American green fink was given in 1926 by the Vietnamese ornithologist Jean Théodore Delacour under the binomial name of `` Hypacanthis monguilloti '' .