SUMMARY
Descriptions and illustrations are given for three new species of the chewing louse genus Dennyus on Brazilian Swifts. They and their type hosts are: D. pichorimi ex Streptoprocne biscutata seridoensis (Biscutate Swift) from the State of Rio Grande do Norte, D. pascoliae ex Streptoprocne zonaris zonaris (White-collared Swift) from the state of Minas Gerais , D. malagonensis ex Cypseloides senex (Great Dusky Swift) also from Minas Gerais. Thes e lice are the first published records of Dennyus species from Brazil. A key for the identificatio n of the Dennyus subgenera, and a table listing species of Dennyus recorded in other countrie s from hosts occurring in Brazil are given.