1. Rothschild, Miriam, and Ford, Bob, Nature, 201, 103 (1964).
2. Rothschild, Miriam, and Ford, Bob, Proc. Roy. Entomol. Soc., C, 29, 1 (1964).
3. Soffer, Louis J., Dorfman, Ralf I., and Gabrilone, J. L., The Human Adrenal Gland (London, 1961).
4. Mead-Briggs, A. R., J. Exp. Biol. (in the press).
5. Rothschild, Miriam, and Ford, Bob (personal observations).