1. Arthur, D. R., Ticks and Disease, 307–318 (1962).
2. Chinery, W. A., Exp. Parasit. (in the press).
3. James, M. T., and Harwood, R. F., Herm's Medical Entomology, 360–361 (1967).
4. Murnaghan, M. F., Proc. tenth int. Cong. Ent., 3, 841–847 (1958).
5. Perry, W. L. M., Pharmacological Experiments on Isolated Preparation, (2nd edn), (Livingstone, Edinburgh, London, 1970).