48 



THE MEXICAN COTTON-BOLL WEEVIL. 



after emergence is 130 days for males at Dallas, Tex. (1907), and 118 

 days for females at Calvert, Tex. (1907). The maximum recorded 

 length of life of hibernated weevils unfed after emergence is 90 days 

 for males and 88 davs for females, both records being made at Dallas 

 in 1907. 



A considerable number of records are available to illustrate the 

 relative sustaining power of the various kinds of weevil food. (See 

 Table XIII.) These records are especially valuable in making com- 

 parisons with the sustaining power of other plants suspected of being 

 possible food plants. It will be noticed that the same food has vary- 

 ing sustaining power at different seasons. 



Table XIII. 



DURATION OF LIFE OF REARED BOLL WEEVILS WITHOUT NORMAL FOOD. 



Season. 



June-July . 



Do 



Do.... 



Total for reared weevils 

 with grain. 



July. 

 May. 

 July. 

 May. 

 July. 



Do. 

 Do. 



Total for reared weevils on 

 weed leaves. 



June- July 



August-October . 



Total for reared weevils on 

 water only. 



June 



August 



July 



June 



July 



Do 



June 



September 



September-November. 



Total for reared weevils on 

 malvaceous buds. 



September 



October November — hibernation 



quarters offered. 



Sustenance provided. 



Hay.. 

 Oats . . 

 Corn.. 



Tie vine 



Hibiscus leaf... 



Sunflower 



Okra leal 



Pigweed 



Blood weed 



Bermuda grass . 



Water. 

 ....do. 



Jap. Hibiscus buds 



....do 



Callirrhoe buds 



Hibiscus alricanus buds... 



Hollyhock buds 



Hibiscus moscheutos buds. 



Okra buds 



Hibiscus milliards buds... 

 ....do 



Fresh sorghum cane. 



Num- 

 ber of 

 weevils 



Number 



of weevil 



days. 



47.7 

 44.9 

 34 



101 



339. 8 

 306. 3 



25 



19 



235 



92 



IS 



36 



78 



305 



486 



1,294 



193 



020 



A ver- 

 age lon- 

 gevity. 



2.5 

 2.9 

 3.4 



3 



3 



3.2 



3.3 



3.4 



3.6 



3.8 



3.3 



4.3 

 4.2 



2.0 

 2.1 

 5.6 



5.7 

 6.0 

 6.0 

 7.8 

 7.2 

 27.0 



8.1 



11.3 

 24.0 



Maxi- 

 mum 

 lon- 

 gevity. 



10 



10 



' + 43 



43 



DURATION OF LIFE (AFTER EMERGENCE) OF HIBERNATED WEEVILS WITHOUT 



NORMAL FOOD. 



June-July 



Do 



Total for hibernated weevils 

 without water. 

 March-May 



Excelsior 

 Rice 



Water... 



1 This weevil then entered hibernation and remained therein 126 days. 



