First report of Polygenis (Polygenis) roberti beebei (Fox, 1947) (Siphonaptera: Rhopalopsyllidae) in Argentina, with a new host record and morphological data.

In the present study we report the presence of Polygenis (Polygenis) roberti beebei (Fox, 1947) for the first time in Argentina (23 degrees 56'S, 64 degrees 28'W, Jujuy Province). A new host record (the rodent Oryzomys russatus) and morphological details are also presented. Although the Argentinean specimens fit descriptions and illustrations given previously, the only studied male differs from the specimens collected from other localities in the characteristics of its aedeagus. Collections of further material and morphological studies are needed in order to analyse the taxonomic status of the specimens from Argentina.