ILLUSTRATIONS 



PLATES. 



Page. 

 Plate I. Weather-recording apparatus and fence-row shelter. Fig. 1. — 

 Weather apparatus used in recording temperature and humidity 

 conditions. Fig. 2. — Typical weedy fence-row, affording excel- 

 lent shelter for weevils 30 



II. Favorable shelter conditions in and around fields. Fig. 1. — Cotton 

 field adjoining grove of trees laden with Spanish moss ( Tillandsia 

 usneoides). Fig. 2. — Near view of moss. Fig. 3. — Cotton stalk 

 having many bolls infested by weevils at hibernation time 30 



III. Seed house and hibernation cage, Keatchie, La. Fig. 1. — Seed house 



opposite which the first sign of weevil work was found at Keatchie, 

 La., in 1905. Fig. 2. — Large cage built for hibernation experi- 

 ments in 1905-6 38 



IV. Hibernation experiments, Dallas, Tex., 1905-6. Fig. 1. — Four-section 



cage used for experiments, built over cotton. Fig. 2. — Shelter con- 

 ditions as occurring naturally in section 1 50 



V. Shelter conditions in Dallas, Tex., experiments, 1905-6. Fig. 1. — 

 Piled cotton stalks and piled boxes in section 2. Fig. 2. — Stand- . 



ing cotton stalks versus piled leaves, section 3 50 



VI. Cages for hibernation experiments in Texas, 1906-7. Fig. 1. — Dallas, 

 Tex., cage on flat, black-waxy land. Fig. 2. — Calvert, Tex., cage 

 on slightly sloping, sandy land in post-oak region. Fig. 3. — 

 Victoria, Tex., cage on sandy-loam slope between bottom and 



upland 56 



VII. Shelter conditions, Dallas, Tex., cage. Fig. 1. — Active weevils try- 

 ing to escape through wire on October 20, 1906. Fig. 2. — Section 

 1, in which weevils were placed October 13, 1906, 2.61 per cent 

 surviving. Fig. 3. — Section 4, started October 16, 1906, 4.07 per 



cent surviving 64 



VIII. Hanging moss as affecting hibernation and emergence. Fig. 1. — 

 Section 7, with hanging moss in top of cage. Fig. 2. — Same sec- 

 tion, ground conditions, started October 24, 1906, 6.95 per cent 



surviving; emergence ceased June 17, 1907 74 



IX. Shelter conditions producing average survival at Dallas, Tex. Fig. 

 1. — Section 8, started October 30, 1906; emergence ceased June 15, 

 1907; survival, 8.85 per cent. Fig. 2. — Section 5, started Novem- 

 ber 5, 1906; emergence ceased May 15, 1907; survival, 12.22 per 

 cent. Fig. 3. — Section 3, started November 12, 1906; emergence 

 ceased May 21, 1907; survival, 14.74 per cent 74 



X. Exceptionally favorable conditions and boll experiment. Fig. 1. — 

 Section 10, a, bolls exposed on surface; h, corner where bolls 

 were buried 2 inches deep, started December 6, 1906; emergence 

 ceased May 2, 1907; survival, 4.51 per cent. Fig. 2. — Section 9, 

 stalks left, started November 13, 1906; emergence ceased June 



19, 1907; survival, 25.92 per cent 74 



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