52 HTBEBNATION OF THE COTTON BOLL WEEVIL. 



Table XXVIII.— Intermittent activity of unfed emerged weevils, 1906. 



Locality. 



When 

 collected. 



When 



put in hi- 

 bernation. 



When 



removed 

 from hi- 

 bernation. 



When 

 rehiber- 

 nated. 



Weevils 

 put in rehi- 

 bernation. 



Date of 



lirst ex- 

 amina- 

 tion. 





1905 



Nov. 25 



iNOv. 7,13 



\Dec. 11 



190G 

 Nov. 1 



1905 

 Nov. 27 

 Nov. 7, 13 

 Dec. 11 



1900 

 Apr. 19 



[Apr. 6 



Mar. 1 



1900 

 Apr. 23 



Apr. 16 

 Mar. 7 



20 

 7 



8 



May 10 

 Apr. 24 



May 11 

















Locality. 



Calvert, Tex... 

 Victoria, I ex. 

 Brenham, Tex 



Weevils 



surviv- 

 ing. 



Date of 

 second 



- 

 nation. 



10 May 22 

 3 • May 10 

 2 May 23 



Weevils 



surviv- 

 ing. 



Date of 



third 

 exami- 

 nation. 



Weevils 



surviv- 

 ing. 



June 8 



Date of *""■» 



death of 

 longest 

 survival. 



June 8 

 May lo 



length of 



life in 

 rehiber- 



Days. 

 30.4 

 19.1 



May 31 



May 31 67 4 



The records for Calvert and Brenham show a very remarkable 

 power of endurance in some weevils, the average survival for the 

 two lots of 20 and 8 weevils being over thirty and sixty days, 

 respectively. 



CLIMATIC CONDITIONS PRODUCING EMERGENCE FROM HIBERNATION 

 AT DALLAS, TEX., IN 1906. 



In the figure given below, representing climatic conditions and 

 the emergence at various dates, the temperature line given repre- 

 sents only the mean average effective temperature. 



In tins case, as at Keatchie, the emergence occurred especially dur- 

 ing four well-defined periods and the conclusions stated in connection 

 with figure 1 apply equally well to the results shown in figure 4 2. 



EMERGENCE IN THE FIELD AT VICTORIA, TEX., IN 1906. 



The observations upon emergence in the field at Victoria, Tex., 

 in 1906, were begun too late in the spring to indicate the limits of 

 the first part of the period of emergence. For this work a field of 

 about one-half acre was selected in which it was apparent early in 

 May thai there would be a large number of hibernated adults. The 

 observations were planned to furnish information particularly upon 

 two points under field conditions: (1) The determination of t ho 

 period of emergence and (2) the period of activity of emerged wee- 

 vils. The work was done by Mr. A. C. Morgan, who devoted par- 

 ticular attention to a study of this field throughout the season of 

 1906. The method followed was to examine vxvvy plant and ever} 

 square or boll throughout this area. After the first two exainina- 





