n. 



EXPLANATIOX OF TEEMS USED IX BESCEIBIXG THE 

 EXTERNAL FORM OF BUtDS. 



Tardus migratorius, L. 



REFERENCES TO THE FIGURE. 



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

 longing to eacli affixed. 



A. The body in ponorfil. 



B. Tlie region of tlie lienil. 

 C " " " nccl«. 

 D. " " " trunk. 



E. The region of the tail. 



F. " " " wings. 



G. " " " legs. 

 H. The feathers. 



Note. — I am under obtigntions to Professor Sundcvall of Stockholm and Dr. Sclatcr of London for asRlstanrc 

 In correcting and improving the present article.— S. F. Baird. 



