40 BULLETIN 926, U. S. DEPARTMENT OF AGRICULTURE. 
The rate of emergence in Florida as compared to the rates of 
emergence in Louisiana and Texas is illustrated in the accompanying 
diagram (fig. 18). Twenty-five per cent of the boll weevils emerge 
in Florida a few days before the same percentage emerges in Texas 
and at least 20 days earher than in Louisiana. The rate of emergence 
in Texas shows that 50 per cent of the weevils are out of hibernation 
approximately 20 days before 50 per cent are out in Florida. After 
50 per cent of the weevils emerge the figure shows that the rate of 
emergence in Florida closely approximates the rate of emergence 
in Louisiana. This is to be exyected since the hibernation shelter in 
Louisiana and Florida is decidedly more dense than the hibernation 
shelter found in Texas. Table XVII presents the records showing 
the percentage of total emergence of the boll weevil at different dates 
and places where hibernation experiments have been conducted. 
TABLE XVII.—Percentage of total emergence of boll weevils at different dates 
and at different places. 
Retna Tallulah, La. Mansura, La. Dallas, Tex. Calvert, | Victoria, | Madison, 
Date. That 1908 ee ee Tex., Tex., la, 
ieee Aas = 1907 1907 1919 
1910. 1911. 1910. 1909. 1907. 1908. 2 | ‘ | . 
Hebe2iae a= 0.00 0.31 36. 95 1.64 7.20 0.00 0.00 0.00 | 0.00 3.6 
Heby28222ss- . 00 Sail 36.95 3.28 10.61 . 00 . 00 .00 12.01 5.03 
Mana (estene . 00 6.62 39. 92 10. 56 19. 22 24.48 oP. 22. 80 27.92 21.9 
Mar 14: 2328 . 00 10.09 63. 83 15.69 19. 73 36. 36 23.63 31.90 48. 23 30.2 
WiGye, PAE eco . 00 13.56 70.35 21.19 23. 24 57.14 45.45 * 44.30 66. 24 34.2 
Wihie Pree osee 3.93 23.34 72.52 38.05 |} 30.96 Cle 7 55. 45 57.20 79.35 36.4 
JX} 0) hy Me eas 6.87 35. 95 74.69 46. 53 38. 16 75.70 63.63 64. 20 84.16 41.4 
JNO eS WE Rees 24. 54 41.5 81. 21 49. 42 43.87 81.28 68.18 70. 40 89. 58 o2e 
AMT Sasa SYA iLL 46.05 Sieuiie 52.41 47.78 84.46 74. 54 77.40 93. 80 ie 
ING PA 3Go6e 40.67 | 48.89} 96.42) 53.86! 56.39) 85.74 87.27 79.51 95. 02 58.4 
Mee 2e2 = sae 52.73 61.83 96. 42 60. 41 61.30 88.62 90.91 82.62 95. 88 61.2 
WIEN? Qsde5ue 60. 44 70. 66 98.59 AB 1) “Orel 92.30 91. 82 88. 73 97. 50 85.4 
Mayl6s225-2 125 75.39 98.59 75.64 Uap 95.75 94.55 91.94 98. 36 90.4 
May 23..-.-. 86.41 88. 64 98.59 84.77 82. 43 98. 76 98.18 94, 95 98. 92 92.5 
Wien eoecous 91.60 93.69 98. 59 92.77 89.73 99. 34 98.18 97.56 99.18 94.7 
Ajonnicy see ae 97.36 99.05 | 100.00 98. 43 96. 83 99.78 99.09 99.17 99. 90 98. 5 
suNeW3s2 22. 2 99.19 99.68 | 100.00 99. 89 97.83 99. 88 99.09 99.68 99. 97 99.1 
June205 99.61 99.68 | 100.00 | 100.00 98.74 | 100.00 | 100.00 99. 99 100. 00 99.6 
JuMe ie 22 oe 99.89 | 100.00 | 100.00 | 100.00 99.94 | 100.00 | 100.00 100. 00 100. 00 99.9 
dol, 4 eaSe 100.00 | 100.00 } 100.00 | 100.00 | 100.00 |} 100.00 | 100.00 100. 00 100. 00 99.9 
JU key (ene eo lpg Sp I Ch eee ok eves og Cees | ee oh eee oe | ike See eens tees 100.00 
NUMBER OF BOLL WEEVILS SURVIVING THE WINTER WHEN HIBERNATING IN 
THE OPEN FIELD. 
In Table XVIII are presented the data on the number of weevils 
surviving the winter when installed in the hibernation cages at dif- 
ferent dates in the fall under open field conditions. Of a total of 
4.300 weevils installed in the cages an average of 5.76 per cent sur- 
vived the winter. The cage installed on November 15 showed the 
greatest percentage of the total emergence, while the cage installed 
on October 1 gave the smallest percentage of emergence. Emergence 
from hibernation started in all of the cages, except the one installed 
on December 1, on February 20. As was to be expected the date of 
