and of Saint Lucia and Saint Vincent and the Grenadines, Lesser Antilles (Hymenoptera, Apoidea, Halictidae).

The new species and the first halictid bees documented from Saint Lucia , Lasioglossum (Dialictus) luciae, and L. (Habralictellus) delphiae are described. A fourth species, L. (D.) dominicense, is tentatively recorded from the island. The species are illustrated and compared to similar ones from the Lesser Antilles. and from neighbouring Saint Vincent and the Grenadines are reviewed and a key to provided, including the description of another new species, Ashmead and Ashmead are synonymised under (Ashmead). Notes on the obscure Lasioglossum (Dialictus) minutum (Fabricius) are provided. A new name, Lasioglossum (Homalictus) minuens, is provided for a secondary homonym Pauly. The potential for additional species richness in Saint Lucia and the Lesser Antilles is briefly discussed.