Riberazantaena, a new hydraenid genus from the Eastern Arc Mountains of Tanzania (Coleoptera, Hydraenidae)

A new genus, Riberazantaena gen. nov., is erected to accommodate Protozantaena grebennikovi Perkins, 2009 and Riberazantaena latissima sp. nov. from the South Pare Mountains in Tanzania. Both species are apparently endemic to Eastern Arc mountain forests, adults living terrestrially in damp leaf litter. Protozantaena Perkins, 1997 is redefined in light of the description of the new genus, and a revised key to genera of Parhydraenini is provided.