LOCUST AND GRASSHOPPER PROBLEM 387 
hazards, among which locusts and grasshoppers have already 
proved to be outstanding. These particular hazards can be 
avoided if they are carefully studied before it is too late. One 
hopes that the future development of arid lands will not follow 
the pattern of the semi-arid ones, where a rapidly expanding ex- 
ploitation of the land preceded an understanding of its long- 
range consequences. In the typical semi-arid country of North 
Africa, the Moroccan locust 1s called in Arabic djerad-el-adami— 
man’s locust. This name is appropriate to most locusts and grass- 
hoppers, as it has been man who has encouraged and continues 
to encourage them by short-sighted land usage. 
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1. Andrewartha, H. G. 1943. The significance of grasshoppers in some 
aspects of soil conservation in South Australia and Western Aus- 
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2. Bei-Bienko, G. Y. 1936. The geographical distribution on zones of 
economic importance of the Moroccan Locust (Dociostaurus maroc- 
canus Thnb.) in U.S.S.R. [In Russian.] [tog? Rab. vsesoyuzn. Inst. 
ZLashch. Rast. 1935, 16-20. 
3. Brown, E. S. 1947. The distribution and vegetation of egg-laying 
sites of the Desert Locust (Schistocerca gregaria Forsk.) in Tripoli- 
tania in 1946. Bull. Soc. Fouad Ent. 31, 287-306. 
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langosta mediterranea e marroqui (Dociostaurus maroccanus 
Thunb.). Bol. Pat. veg. Ent. agric. Madr. 17 (1949), 209-242. 
5. Chetyrkina, I. 1936. The geographical distribution and zones of 
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Kazakhstan. [togi Rab. vsesoyuzn. Inst. Zashch. Rast. 1935, 20-22. 
6. Davies, D. E., 1952. Seasonal breeding and migrations of the Desert 
Locust (Schistocerca gregaria Forskal) in north-eastern Africa and 
the Middle East. Auti-Locust Mem. 4, 56 pp. 
7. Donnelly, U., 1947. Seasonal breeding and migrations of the Desert 
Locust (Schistocerca gregaria Forskal) in western and north western 
Africa. Anti-Locust Mem. 3, 43 pp. 
8. Eig, A., 1935. Ecologie du Criquet Marocain on Iraq. Bull. En- 
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g. Filip’ev, I. N. 1929. The locust question in Soviet Russia. [Vth 
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