50 HIBERNATION OF THE COTTON BOLL WEEVIL. 



Table XXVI. — Large-cage experiments in hibernation at Dallas. Tex., 1905-6 — Con. 





Kind of shelter. 





Emergence l>y period 



3. 





Total 

 sur- 

 vival. 



Par- 



Rank 

 of 



Section 

 of cage. 



Mar. 

 22-31. 



Apr. 

 1-10. 



Apr. 

 11-2U. 



Apr. 

 21-30. 



1-10. 



May 

 11-20. 



May 



21-31. 



age 



of 



sur- 

 vival. 



cages 

 on 



I 'iisis 

 ofsur- 

 vival. 



I 









2 









 



1 



3 



G 



1 

 



2 







7 





 



4 



3 



3 



1 

 



4 

 



1 





 



2 

 



1 



? 





 





 



o 



13 



8 



18 



2 

 1 



0.5 



1. ni 



.12 



2 



11: 



Pt. 1... 



Pt.2... 

 Ill: 



Pt. l. . 



Cotton stalks removed 



.March 22, 1906. 

 Cotton stalks and leaves. .. 



4 



1 

 5 



Pt. 2... 



Bay 



7 



IV: 



Pt. l... 







 



4 



3 



2 



n 



1 

 



2 

 



12 

 2 



.56 



3 



Pt.2... 



Corn and cotton stalks 



Total and average. . . 



2 







6 





2 



17 



12 



13 



5 



5 



2 



56 



.5 





The division of sections 2, 3, and 4 was made by inserting a par- 

 tition of cheese cloth early in the spring of 1906 before any weevils 

 became active. The percentage of survival has been based upon 

 the total number of weevils placed in the four sections. It should 

 be borne in mind that the conditions at the time of entrance into 

 hibernation were decidedly unfavorable for the weevils, as is shown 

 in the fact that about 35 per cent had died before December 26 and 

 under such conditions as to indicate that they were very weak at the 

 time they were placed in the cage. Xo allowance has been made for 

 the escape of weevils through the wire. It thus appears that approxi- 

 mately 1 per cent of the weevils which really may be said to have 

 entered hibernation survived and emerged between March 21 and 

 May 31. The survival in the bare section was less than one-fourth 

 of the smallest survival in the sections provided with rubbish. For 

 the sake of comparison with the records at Keatchie, La., some data 

 from the Dallas experiments have been used in connection with 

 those at Keatchie in several of the tables which have already been 



NATURE OF WEEVIL ACTIVITY FOLLOWING EMERGENCE FROM HIBER- 

 NATION. 



In following the activity of emerged weevils it was deemed advis- 

 able to pursue a very different method at Dallas from that which 

 has been described at Keatchie. Instead of removing weevils from 

 the sections in which they had emerged, each weevil was marked in 

 such a way as to make it possible to recognize it individually and the 

 weevils were allowed to remain practically undisturbed in the sec- 

 tion where they had spenl the winter. In making the daily exam- 

 inations record was kepi of the appearance 4 or disappearance of each 

 individual weevil. No food was supplied in any of the sections until 



