Aphids belonging to the genus Aphis collected on species of Discaria, Condalia, Colletia, and Trevoa (Rhamnaceae), and on Tristerix sp. (Loranthaceae) parasitic on Colletia spinosissima, in Argentina and Chile were studied. Apterous parthenogenetic females (fundatrigeniae and fundatrices), viviparous alatae females, oviparous females, and males of Aphis conflicta, n. sp., are described. A key to Aphidini species that could be found on Rhamnaceae in South America is given.
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Vol. 110 • No. 2