ILLUSTRATIONS. 



PLATES. 



Page. 



PLATE I. Hairy and downy woodpeckers Frontispiece. 



II . Yellow-bellied sapsucker 



III. Red-headed woodpecker 32 



IV. California woodpecker 40 



V. Lewis woodpecker 40 



VI. Flicker 48 



TEXT FIGURES. 



FIG. 1. Tongues of woodpeckers *'. 



2. Special development of tongues of woodpeckers 



3. Wood from which woodpecker has extracted insect 9 



6 



