1. Lewis, E. B. Am. Zool. 3, 33–56 (1963); Nature 276, 565–570 (1978).
2. Tazima, Y. The Genetics of the Silkworm (Logos, London, 1964).
3. Garcia-Bellido, A. Am. Zool. 17, 613–629 (1977).
4. Yu, S. thesis, California Inst. Technol. (1949).
5. Le Calvez, J. Bull. Biol. Fr. Belg. 82, 97–113 (1948).