Four new species of Mesorhaga Schiner (Diptera: Dolichopodidae) from Northeastern Brazil, with an identification key to South American species of the genus.

Four new species of the sciapodine genus Mesorhaga Schiner (Diptera: Dolichopodidae) are described from the states of Piauí and Maranhão (Northeastern Brazil): Mesorhaga danbickeli sp. nov., M.