HIBERNATION. 



117 



Table LIII. — Intermittent activity of unfed boll weevils after emergence, at Dallas, Tex., 



1906. 

















Weevils "rehibernated"— 



i 



3 



a 



—T co 

 03 >» 

 > 03 



fc-o 



i- <— « 

 3 O 

 ra ^ 



of 





Once. 



Twice. 



Three times. 



a 

 o 



0) 



O 



En 



i 



a) 

 J 



3 

 O 



> 



CO 



a> 

 J 



a) 



1 



3 

 > 



bo 



3 



CD 



i 



A 



CD 



i 



go 



03 

 ft 



CD 



i 



a 



ra 



>> 

 03 

 ft 



4G 



2G 



15 



11 



6 



2 



2 



l 



17 



8.7 



6 



7.2 



2 



3.5 



6.8 



The observations recorded in Table LIII show conclusively that wee- 

 vils may leave their winter quarters during warm days and, failing to 

 find food, they may again become quiet and emerge again after a con- 

 siderable interval. This fact has an important bearing upon the 

 proposition which is frequently advanced by planters of starving the 

 weevils in the spring by deferring the time of planting. While many 

 weevils might perish in this way, it is certain that many more would be 

 able to survive and reappear at intervals, so that there would be plenty 

 of weevils to infest the crop, even though this might be planted as 

 late as is possible to secure any yield. 



Other observations were made upon the intermittent activity of 

 unfed weevils during the spring of 1906. Weevils from Calvert, Vic- 

 toria, and Brenham, Tex., were tested. The weevils from Calvert 

 and Victoria had been confined in hibernation cages throughout the 

 winter. Those from Brenham were collected in the field early in 

 March. None of these weevils had tasted food after emergence. 

 The results are shown in Table LIV. In this table the date of death, 

 unless otherwise indicated, is considered as having been the middle 

 date between the last examination at which a weevil was found alive 

 and that at which it was found dead. 



Table LIV. — Intermittent activity of unfed emerged boll weevils, 1906. 1 



Locality. 



When 

 collected. 



When 

 put in hi- 

 bernation. 



When 

 removed 

 from hi- 

 bernation. 



When 

 rehiber- 

 nated. 



Weevils 

 put in rehi- 

 bernation. 



Date of 

 first ex- 

 amina- 

 tion. 



Calvert, Tex 



1905 

 Nov. 25 

 /Nov 7,13 

 \Dec. 11 



1906 

 Nov. 1 



1905 

 Nov. 27 

 Nov. 7,13 

 Dec. 11 



1906 

 Apr. 19 



JApr. 6 

 Mar. 1 



1906 

 Apr. 23 



Apr. 16 

 Mar. 7 



20 



7 



8- 



May 10 



Victoria, Tex 



Apr. 24 





May 11 







Locality. 



Weevils 

 surviv- 

 ing. 



Date of 

 second 

 exami- 

 nation. 



Weevils 

 surviv- 

 ing. 



Date of 

 third 

 exami- 

 nation. 



Weevils 

 surviv- 

 ing. 



Date of 

 death of 

 longest 

 survival. 



Average 

 length of 



life in 

 rehiber- 

 nation. 



Calvert, Tex 



10 

 3 

 2 



May 22 

 May 10 

 Mav 23 



6 

 

 1 



June 8 







June 8 



May 10 

 May 31 



Days. 

 30.4 





19.1 





May 31 







67.4 























i From Bulletin 77, Bureau of Entomology, p. 52. 



