SYNOPSIS.A checklist is given of the 89 named species of the gregarine family Lecudininae, exclusive of the 42 named species of the genusLecudina(phylum Apicomplexa. class Sporozoea, subclass Gregarinia, order Eugregarinida, suborder Aseptatina). The list includes also the synonyms, host names, locations in hosts, known geographic distributions of the species, as well as key references. Another list is given of synonyms,lapsi calami, nomina nuda, etc., associated with the genera. A new genus, Paraophioidina g. n., with type species,Paraophioidina haeckeli(Mingazzini, 1891) and a new species, Lankesteria ormieresi sp. n., are described. There are also new combinations in the generaBhatiella, Ancora, Monocystella, Ascocystis, andParaophioidina.