1. Gunn, D. L., A. Rev. Ent., 5, 279–300 (1960).
2. Kennedy, J. S., Colloques int. Cent. natn. Rech. scient., No. 114, 283–297 (1962).
3. Rainey, R. C., 13th Int. Congr. Ent., Moscow, 1968, 2, 379 (1971).
4. Roffey, J., Popov, G., and Hemming, C. F., Bull. ent. Res., 59, 675–680 (1970).
5. Waloff, Z., Anti-Locust Mem., No. 9 (1966).