1. The technical assistance of A. Pillez is gratefully acknowledged.
2. Andriès, J. C., Int. J. Insect Morph. Embryol.5 (1976) 393.
3. Andriès, J. C., unpublished.
4. Andriès, J. C., and Tramu, G., C.R. Acad. Sci. Paris299 (1984) 181.
5. Andriès, J. C., and Tramu, G., unpublished.