Menacanthus bonariensis new species (Phthiraptera: Menoponidae), parasitic on the White-bellied Sparrow, Zonotrichia capensis hypoleuca (Todd, 1915) (Aves: Passeriformes: Fringillidae) in Buenos Aires Province, Argentina

The new species Menacanthus bonariensis is described and illustrated from specimens collected off Zonotrichia capensis hypoleuca (Todd, 1915) from coastal areas in the NE of Buenos Aires Province, Argentina. Morphologically the new species is close to M. robustus (Kellogg, 1896), but with larger females, longer ocular seta 19 and ventral spinous processes, greater number of setae on certain tergites and sternites, and fewer setae in the subgenital plate. Descriptions of the male, the three nymphal instars and the egg are also included, with comments on prevalence and spatial relationship with other species of lice of the genera Philopterus Nitzsch, 1818, Ricinus De Geer, 1778 and Machaerilaemus Harrison, 1916, which are found on this host in different populations of the geographicalarea mentioned above.