11 



Page. 

 Plate XIX. Figs. 79 and 80. — Small bolls containing weevils when found 



shipped with seed into uninfested localities 124 



Fig. 81. — Comparison of pilosity on stems of American and 



Egyptian cotton 124 



Fig. 82. — Gelatin formation in boll following feeding punctures, 



dried and blackened 124 



XX. Fig. 83. — Gelatin formation in square after drying 132 



Fig. 84. — Larva of Br aeon mellitor attacking larger larva of boll 



weevil in the square 132 



Fig. 85.—Pediculoides ventricosus breeding upon wasp larvse 132 



XXI. Fig. 86. — Cage work in studying effect of poisons in the field 3 56 



Fig. 87. — Experimental apparatus for testing effect of hydro- 

 cyanic acid gas upon weevil stages 156 



Fig. 88. — Experimental apparatus for testing effect of formalde- 

 hyde vapor upon weevil stages 156 



XXII. Fig. 89. — Weevils killed in passing through cotton gin 156 



Fig. 90. — Remains of weevils passed through main fan at gin- 

 nery 156 



XXIII. Fig. 91. — Passing weevils through gin — a, seed, and b, mote col- 

 lection 156 



Fig. 92. — Gin opened, showing spaces through which weevils 



escape the action of the saws 156 



Fig. 93. — Cotton field in weevil-infested territory producing a 



bale per acre 156 



TEXT FIGURES. 



Fig. 1. Map showing increase of weevil-infested territory between the years " 



1901 and 1904 25 



• 2. Mexican cotton boll weevil; head, showing rostrum and antennae 50 



3. Diagram showing average activity of five female weevils 82 



4. Diagram comparing outline of general weevil movement in a field with 



outline of present weevil-infested area Ill 



5. Map showing successive weevil movements into Louisiana 130 



6. Parasite of boll weevil [Bracon mellitor) 145 



7. Enemy of boll weevil {Pediculoides ventricosus) 146 



8. A native ant enemy of the boll weevil {Sole7iopsis geminata) 149 



