Bui. 39, Biological Survey, U. S. Dept. of Agriculture. 



Plate V. 



Work of Flicker and Sapsuckers. 



[1, Holes made by flicker in ranch buildings near Haywards, Cal. 2, Type of sapsuckerwork on 

 white birch; 3, on apple; 4, on willow ( Sulix conlata), holes enlarged vertically by continued 

 excavation at upper end; 5, on willow, almost complete barking; 6, on pitch pine, tree killed.] 



