1. Wolf, J., and Barker, A. N., Identification Methods for Microbiologists, Part B (edit. by Gibbs, B. M., and Shapton, D. A.), 93 (Academic Press, New York, 1968).
2. Singer, S., Goodman, N. S., and Rogoff, M. H., Ann. NY Acad. Sci., 139, 16 (1966).
3. Burges, H. D., and Hussey, N. W., Microbial Control of Insects and Mites, 861 (Academic Press, New York, 1971).
4. Cantwell, G. E., and Laird, M., J. Invert. Pathol., 8, 442 (1966).
5. Kellen, W. R., Clark, T. B., Lindegren, J. E., Ho, B. C., Rogoff, M. H., and Singer, S., J. Invert. Pathol., 7, 442 (1965).