18 PARASITES OF THE COTTON BOLL WEEVIL. 



The highest percentages obtained in each class arc as follow--: 

 In shade on wind la ml g. 7 



In Mm OD woodland 



In shade of plain- on prairie 8.2 



In sun on prairie 10. 1 



Should fun her inquiry prove thai sun-dried squares arc the most 

 highly parasitized, another reason is presented for wide row-. 



GEOGRAPHICAL CONSIDERATIONS. 



By far the most important facts established by the table of per- 

 centage of parasitism (Table IV) were elicited by using the geograph- 

 ical map of Texas, published in the census of 18S0, as a base. 



I. The alluvial prairie of the Rio Grande is represented by Browns- 

 ville with an average percentage of parasitism in all forms of 6.1. 



II. The coast prairie is represented hj Corpus Christi with 8.5 per 

 cent, Goliad with 8.0 per cent, Cuero with 5.5 per cent, and Victoria 

 with 3.7 per cent. 



III. The Edwards plateau is represented by Junction with 8.2 per 

 cent, Roosevelt with 6.9 per cent, and 16 miles south of Roosevelt 

 with 2.2 per cent. This latter case was a farm with very rank growth 

 of cotton, from which shaded squares were picked on the ground. 

 The weevil had not been present long. 



IV. The black prairie is represented by Kerrville with 3.3 per cent, 

 Taylor with 2.6 per cent, Corsicana (IVb) with 6.0 per cent, and 

 Dallas with 5.1 per cent. 



V. The cross timbers are represented by Waco with 11.4 per cent. 



VI. The eastern hardwoods are represented on the south by 

 Beeville with 1.2 per cent, Hallettsville with 2.8 per cent, each at the 

 tip of an extension of this region, and by Calvert with 2.1 per cent . 

 Palestine 3.7 per cent, Mineola 2.0 per cent, Overton 1.9 per cent. 

 Marshall 8.0 per cent, Mansfield, La., 2.9 per cent, Many, La., 3.8 

 per cent. Marshall is probably represented by a field on a red-land 

 knoll, which would~account for the discrepancy. 



VII. The eastern pine country is represented by Trinity with 2.4 

 percent, and Orange, La., with 0.9 per cent. Trinity is in a transi- 

 tional region of pines and hardwoods, but seems to belong more 

 typically to the hardwood region. 



It will be readily observed that regions I, II, III, V. with Corsicana 

 in IVb, which really belongs to the brown loam region in the eastern 

 hardwoods, and Marshall in VI, which belongs to the red-land areas 

 of the eastern hardwoods, are the most highly parasitized, while the 

 regions IV, VI, and VII are the lowesl parasitized. 



The map on the opposite page (fig. 4) is presented to illustrate these 

 statements. 



While it may be merely a coincidence thai the places in the same 

 belt have about the -a me proportion of parasitism, it is nevertheless 



