Amongst some insects bred this year from Lecanium viride on coffee in Mauritius, and forwarded to the Imperial Bureau of Entomology for identification by M. d'Emmerez de Charmoy, were two species of Chalcids belonging to the genera Diversinervus, Silv. (1915) and Tetrastichus, Hal. (1843) respectively. The former, which appears to differ considerably from the genotype, is here described as a new species ; the latter so closely agrees with Tetrastichus sicarius, Silv., that I have not thought it advisable to propose a new name. My best thanks are due to Professor Silvestri for his kindness in examining preparations of both species.