Aphis mirabilis sp. n. (Hemiptera, Aphididae, Aphidina), a South American species resembling A. craccivora, and further data on A. tropaeoli.

We examined 1367 apterous viviparae from 151 samples to study Aphis craccivora, A. tropaeoli and a third, possibly new species in Argentina, resembling both. Principal component analysis (PCA), followed by hierarchical clustering of principal components (HCPC), revealed clusters based on 33 morphological characters of 206 selected specimens.