I M I RGENI l FROM HIBERNATION, 190* 



81 



There is no indication thai the time at which an experiment was 

 begun affected essentially the nature of the emergence movement. 

 The nature of the shelter, however, does seem to bave an important 

 influence. This is most clearly marked in section 7, where the ex- 

 perimental shelter was Spanish moss. At Victoria after about the 

 12th of April more weevils emerged from this section than from all 

 others combined. This effect was less marked in the other localities, 

 but in each case there appeared to be a considerable delay in emer- 

 gence, due to the nature of this shelter. Owing to the Fact that this 

 moss is living and growing while hanging in the cages or on the trees, 

 it takes up moisture as no other class of shelter does. The evapo- 

 ration of this moisture during the daytime then serves to keep the 

 mass of moss cool, and it is a well-known fact that the temperature 

 in bunches of this moss is several degrees lower than that of the air 

 during the daytime. Undoubtedly the lower temperature in the 

 moss is the factor which retards the emergence of the weevils so 

 decidedly. This factor may also be considered responsible for the 

 smaller activity of weevils shown in the moss sections during the 

 winter. (See Table XXXI, p. 63.) 



A somewhat more detailed statement of the emergence shows more 

 plainly the peculiar manner in which this was distributed during 

 1007. The figures are arranged for seven-day periods, and show the 

 average temperature conditions prevailing as well as the percentage 

 total of emergence occurring: during: each week. . 



Table XLIL- Weekly summary of emergence records, showing relation to effective l< m- 



peratures, 1907. 



Date. 



Locality. 



Mean 

 average 

 effective 

 tempera- 

 ture. 



Number 

 of weevils 

 emerged. 



Percent- 

 age of 

 total 

 emer- 

 gence. 



L907. 



(Calvert 



°F. 

 30. 

 19.7 



24.7 



25. 7 

 21.0 

 30.5 

 30.5 



27. 

 29.0 







33.0 

 32.5 

 23.0 

 17.:. 

 ::. 8 



28. 8 

 24.0 

 31.9 

 24.9 

 20.0 

 28. 7 

 17.8 

 13.0 

 L9.0 

 24 8 

 16.3 



420 

 848 

 I a 363 

 \ M 

 168 

 413 

 609 

 228 

 721 

 549 

 237 

 ,',0 1 

 397 

 128 

 135 

 117 

 L15 

 194 

 165 

 134 

 ill 



127 



33 



n 

 37 

 58 

 99 

 26 



22. 8 





1 Dallas... 



24.5 



Mar. 1 . 





a 12.0 





[Calvert 



15.9 

 9 1 



Mar. ^ 11 



Dallas 



11.9 







20.3 





[Calvert 



12. 1 



Mar. LS 21 



Dallas 



20.8 







18.0 





(Calvert 



L2.9 



Mar. 22 28 





1 1 6 





[Victoria 



13. 1 



Mar. 29-Apr. l 



(Calvert 



7.0 

 1.0 







[Victoria 



L8 





[Calvert.... 



6.2 



Apr. 5-11 



Dallas 



|\ Ictoria 



5.6 



.5.4 





[Calvert 



l.:\ 



\pr 12 L9 



Dallas 



1 2 









ii.... 



1.8 



Apr. 19 26 



Dallas 



[Victoria. . .-. 



L.3 



1.2 





[Calveri 



.; I 



Apr. 26-May2 



Dallas 



[Victoria 



2. 9 

 .86 



a On February 28. 



90317— Bui 



—09 6 



