Plate III. 



Fig. 1. Hyoid of Flicker (Colaptes auraius) (adult, X 2). 



2. Hyoid of Flicker {Colaples awratus) (recently hatched, X 2). 



3. Hyoid of Eed-naped Sapsuoker (Sphyrapiciis varins nuohalis) (x 2). 



4. Tongue of recently hatched Downy Woodpecker (Dryoiates puhescms) 



(X4). 



5. Tongue of fully-fledged nestling of Downy Woodpecker {Dryoiates pubes- 



cens) (X 3i). 



6. Tip of tongue of fully-fledged nestling of Downy Woodpecker {Dryobates 



piihescens) (X 6). 



7. Tip of tongue of adult Downy Woodpecker (Dryohates pubescens) (x 6f). 



8. Spines from dorsal tract of tongue of Eed-headed Woodpecker (Melanerpea 



erytkroceplialus) (greatly enlarged). 



9. Spines from dorsal tract of tongue of Ladder-back Woodpecker {Dryo- 



iates scalaris) (greatly enlarged). 



44 



