Two New Feather Mite Species of the Genus Montesauria (Astigmata: Proctophyllodidae) from Thrushes of the Genus Zoothera (Passeriformes: Turdidae) in Japan

Two new feather mite species belonging to the genus Montesauria Oudemans, 1905 (Analgoidea: Proctophyllodidae: Pterodectinae), which were found in thrushes on the genus Zoothera Vigors, 1832 (Passeriformes: Turdidae) in Japan, are described: Montesauria aurea n. sp. from the White's thrush Zoothera aurea toratugumi (Momiyama, 1940) and M. sibirica n. sp. from the Siberian thrush Z. sibirica davisoni (Hume, 1877). The two new species belong to an unnamed species group (Park and Atyeo, 1971) that is characterized by the lack of setae f2 in both sexes and by having ventral apophysis on genu IV in males and spindle like setae h2 in females.