ANIMAL BIOLOGY 



each ; No. 25, Notes on Mosquitoes of the U. S., xoc. ; No. 42 

 Some Insects attacking the Stems of Growing Wheat, Rye, Barley, 



and Oats, sc. ; No. 50, The 

 Cotton Bollworm, 25C. ; No. 51, 

 The Mexican Boll Weevil, 25C. 

 Bureau of Plant Jxdustry 

 Bulletin No. 88, Weevil-resisting 



Adaptations of the Cotton Plant, 



FIG. 186. - Gall fly (enlarged) and oak 



gall with larva, and one from which 

 a developed insect has escaped. 



IQC Thig g ye& &n instructive 



account of the struggle of a plant for existence against an insect 

 enemy. 



FlG. 187. Weevil on a Corylus or filbert. 



