Bui. 74, Bureau of Entomology, U. S. Dept. of Agnculti 



Plate IV. 



Shedding and Retention of Forms in Cotton. 



Fig. 1.— ft, b, e, Normal scars left by shed forms. Pig. '2.— a, h, c. Abnormal scars with forms 

 retained. Fig. 3.— a, Longitudinal section through normal scar; &, longitudinal section 

 through base of retained form. Fig. 1, natural .size; fig. 2, somewhat reduced: fig, 8, 

 enlarged to 2 diameters. (Original. ) 



