Flea holdings from the Carnegie Museum of Natural History and more recent field collections from Papua New Guinea by the junior author (ERE) contained three new species of Striopsylla Holland, 1969, and are described herein: Striopsylla bifurcata, new species; Striopsylla clarki, new species; and Striopsylla flanneryi, new species (Pygiopsylloidea: Stivaliidae, Stivaliinae). New host and distribution records are given for two additional known species of Striopsylla: S. rugata (Jordan, 1937) and S. vandeuseni Holland, 1969. A generic diagnosis is provided, host/parasite relationships are discussed for all species of Striopsylla examined, and a key is provided for all known species of Striopsylla. Miscellaneous records of other flea species belonging to the genera Acanthopsylla Jordan and Rothschild, 1922, Papuapsylla Holland, 1969, and Pygiopsylla Rothschild, 1906, are provided. Pygiopsylla spinata Holland, 1969, is proposed as a junior synonym of Pygiopsylla hoplia Jordan and Rothschild, 1922. With the addition of three newly described species, 78 species of Pygiopsylloidea and eight other species [Ischnopsyllidae (3), Pulicidae (3), and Leptopsyllidae (2)] are documented in Papua Province, Indonesia (West Papua) and Papua New Guinea.