A new species of Aphis (Hemiptera:Aphididae) in Missouri on St. John's Wort, Hypericum kalmianum, and re-description of Aphis hyperici Monell

Aphis mizzou, n. sp. is described from specimens collected in Missouri, USA, on Hypericum kalmianum (Clusiaceae). Both apterous and alate viviparae are described and illustrated and a key is provided to apterae of the six species of Aphis that feed on Hypericum. Neighbor-joining analysis of cytochrome oxidase (COI) and nuclear elongation factor (EF1-) indicated a close relationship of the new species with Aphis hyperici but verified its distinctness, the pairwise sequence divergence for COI between these two species being 3.2%. In addition, Aphis hyperici Monell is redescribed, including first descriptions of the fundatrix, ovipara and alate male of that species.