Nature . .S. Department of Agriculture. Bureau of Entomology, Bull. 50. + plates xxv+figs. 27. (1905.) The Mexican Cotton Bill Weevil. By W. D. Hunter and W. Idem, Bull. Pp. 181+plates xxiii+figs. 8. (1905) NO. T889, vOL. J3~] duced a work of great value to all cotton planters. Thepest i^ recorded from North and South America, the WestIndies, Europe, many parts of India, China, and Japan,the East Indies, Australia and New Zealand, and even inthe Gilbert and Navigator Islands. Of particular interestis the record from the Sudan and British East Africa, butit is not recorded
Nature . .S. Department of Agriculture. Bureau of Entomology, Bull. 50. + plates xxv+figs. 27. (1905.) The Mexican Cotton Bill Weevil. By W. D. Hunter and W. Idem, Bull. Pp. 181+plates xxiii+figs. 8. (1905) NO. T889, vOL. J3~] duced a work of great value to all cotton planters. Thepest i^ recorded from North and South America, the WestIndies, Europe, many parts of India, China, and Japan,the East Indies, Australia and New Zealand, and even inthe Gilbert and Navigator Islands. Of particular interestis the record from the Sudan and British East Africa, butit is not recorded as attacking cotton there. Besidesinfesting cotton, it is equally destructive to corn, and theauthors tabulate seventy other food plants, distributedover twenty-one natural orders. There are excellent plates showing ova, larva; damagingthe buds, tassels and ears of sweet-corn as well as cotton. The injuries are explained, and it is clearly pointed outhow the cotton becomes infested bv the third and fourth. Fig. 1.—Work of Bollworm in Cotton Bolls. 1, Bollworm eating into ahalf-grown cotton boll ; 2, bollworm boring into a full-sized cotton boll ;3, full-grown bollworm and its work in large cotton boll ; 4, cottonboll only partially destroyed by bollworm, two locks open, the othersdestroyed (original). generations of larva, the previous ones feeding upon thecorn. The summary given of the life-history shows that themoth may lay from 500 to 3000 eggs, especially upon the silks of corn and the squares of cotton. Duringwarm weather they hatch in two or three days. In springthe young larva? eat the buds, later the silks and tasselsoi ill can: in August and September they attack thecotton. They bore directly into the squares andbolls, and destroy the hitler. Maturity is reached intwo weeks; they then enter the soil to pupate. Detaileddescriptions are given of all the stages, the effects ofclimate, and variations in colour. Nothing definite isshown to account for the great variation
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