1. Serebrovsky, A. S., Zool. Zh., 19, 618 (1940).
2. Curtis, C. F., Bull. Ent. Res. (in the press).
3. Curtis, C. F., and Hill, W. G., I.A.E.A./F.A.O. Symposium on the Use of Isotopes and Radiation in Entomology, Vienna, 1967 (in the press).
4. MacDonald, W. W., Ann. Trop. Med. Parasit., 56, 373 (1962).
5. Laven, H., Nature, 216, 383 (1967).