n. 



EXPLANATION OF TEEMS USED IN DESCEIBING THE 

 EXTEENAL EOEM OF BIEDS. 



l^NAT.SIZE, 



Tardus migratorius, L. 



REFERENCES TO THE FIGURE. 



N. B. In the figure the adjacent regions are separated by a double bar, with the letters be- 



longing to each affixed. 



A. The body in general. 



B. The region of the head. 



C. " " '■ neck. 



D. " " " trunk. 



E. The region of the tail- 



F. " " " wings. 



G. " " " legs. 

 H. The feathers. 



Note I am under obligations to Professor Sundevall of Stockholm and Dr. Sclater of London for assistance 



in correcting and improving ttie present article. — S. F. Baird. 



