20 THE MEXICAN COTTON-BOLL WEEVIL. 



An early frost on October 29, 1910, throughout all but the coast 

 regions of the infested territory, caused the death of all but a very 

 small fraction of the fall-bred weevils, and consequently the season 

 of 1911 started with a low infestation. The general defoliation by 

 the leaf worm, however, reduced the available food supply and caused 

 a general dispersion, which enabled the weevils to regain considerable 

 lost ground in Texas and Oklahoma, to make remarkable gains in 

 Arkansas, Mississippi, and Alabama, and to invade Florida. 



DISTRIBUTION. 



The territory covered by the boll weevil at the end of the year 1911 

 (see fig. 1) included the southeastern half of the cotton section of 

 Texas, the southeastern corner of Oklahoma, the southern three- 



Fig. 1. Map showing the distribution of the cotton-boll weevil on January 1,1012. (Original.) 



fourths of Arkansas, all of Louisiana, the southern three-fourths of 

 Mississippi, the southwestern corner of Alabama, and the western 

 portion of Florida. In addition to these States the weevil is found 

 throughout Mexico in the cotton-growing region of both the Atlantic 

 and Pacific coasts with the exception of certain mountain regions. 

 Foremost among the excepted regions is that known as theLaguna 

 district in the vicinity of Torreon, Mexico. The weevil has not been 

 recorded from any part of Yucatan excepting the western coast, 

 although it may occur on tree cottons throughout this region. It 

 has not been recorded from British Honduras, but is known to occur 

 throughout the cotton regions of Guatemala and in Costa Rica. 

 There is little doubt but that it also extends into other Central 

 American Republics, although no definite records have ever been 



