Specimens of a Stenodiplosis were received early in 1942 from Mr. A. Moutia labelled “no. 73, ex inflorescence of Stenotaphrum dimidiatum, Mauritius (Reduit), xii.1940.” In a subsequent letter, dated 25th May, 1942, Mr. Moutia stated that the midges were reared in the laboratory from material collected in the fields. He also gave the information that the grass, S. dimidiatum, forms about 40–50 per cent. of the pastures in Mauritius and, though its main mode of reproduction is by its root stock and cuttings, the dispersion of its seeds may to some extent help in bringing a profuse and thick layer of growth.