82 



Table XIX. — Activity of five weevils in different jxtrts of the day. 



Date. 



Period. 



2 



B 



ft 



X 



zt 



P 



be 



.2 



|s 



1=1 



Condition of 

 weevil at end 

 of period. 



Remarks. 



1903. 

 Sept. 2 



Sept. 2-3... 



Sept. 3 



Do 



Do 



2. 30 to 6 p.m. 



93-80 



80-69 



69-85 



85-95 

 95-84 



84-68 



68-83 



83-91 

 91-82 

 82-79 



16 

 3 



12 



18 

 12 



3 



24 



11 



5 



15 



10 



15 

 11 



1 



1 



19 

 8 

 



10 



2 



2 



10 

 6 



3 



4 

 12 



r 



Placed on fresh 



plant. 

 All resting 



All active 





6 p.m. to6 a.m 



6.15 to 10. 15 a. m 



10 40a.m.to2.40p.m. 

 3 to 6. 30 p. m 



Punctures black 



at 6 a. m. 

 3 trying to escape; 



cage moved. 

 Cage moved. 



do 



Placed on fresh 



plant. 

 All resting 



3 moving to ad- 

 jacent squares. 

 All active. 

 All quiet. 

 All feeding 



Sept. 3-4 .. . 



Sept. 4 



Do 



Do 



6. 30 p.m. to 6 a.m 



6. 30 to 10 a.m 



10 a.m. to 4 p.m...... 



4 to 6 p. m 



Feeding punc- 

 tures all black; 

 small square 

 flared. 



Sept. 4^... 



6 p.m. to 9 a.m....... 



Total 



Cloudy; every 

 weevil on same 

 square as at 6 

 p.m. 





108 



81 



60 













An exanfi nation of these figures shows that weevil activity began 

 and ceased at about 75^ F. Activity increased as the temperature 

 rose, and its maximum coincided with the maximum of daily tern- 



FAHRB* 



H£IT 



TIME 



I2pIam 2 3 4 5 6 7 8 9 10 II 12m IPM 2 3 4 5 6 7 8 9 10 II 12p 



100'' 

 95° 

 90° 

 85° 

 80° 

 75° 

 70° 

 65° 

 60° 



















































































.Se 



pCe 



"J^ 













































■d^ 



[.lit 



^ 





^ 



fe^ 









































f 



^ 



' 









\ 



\f. 





































J/ 



/ 















\ 



|^<^^ 



7 





























,.( 



c> 





















V 



^ 

















^ 









Tnf 



rfpt 



^r<i 



^ 





\ 



av 



>j'a 



yet 



Icf 



UVl 



y^ 



'A 



M 



fetr 



aJ^ 



\iv 



-r'ev 



rjy 

































^ 



ud 



epL 



em 



be, 



^j. 



i&. 



»,/ 



Wo, 



































































. 

















































Fig. 3.— Diagram showing average activity of five female weevils (original). 



perature. It then decreased with the falling temperature until it 

 ceased entirely some time during the evening, probably at about 

 75° F. (See fig. 3.) Feeding continued at lower temperatures than 

 oviposition, as is known to be the case during the late fall. 



Examinations made in the field between 6 and 7 a. m. on Septem- 

 ber 4 showed that all weevils, both males and females, were quietly 



