FAMILY LARIDJE. GULLS AND TERNS. 



35 



FAMILY LARID^B. 



GULLS AND TERNS. 

 SUBFAMILY LARINJE. GULLS. 



TAIL, USUALLY NEARLY SQUARE. 



GROUP 1. Wing, 9.50 to 11 inches long. See page 36. 

 GROUP 2. Wing, 11 to 13 inches long. See page 36. 

 GROUP 3. Wing, 13 to 15 inches long. See page 38. 

 GROUP 4. Wing, 15 to 17 inches long. See page 38. 



Section 1. Length, over 21 ; bill, over 2; underparts, white. See page 38. 



Section 2. Length, over 21 ; bill, over 2 ; underparts, not white. See pjjge 39. 



Section 3. Length, over 21 ; bill, under 2; underparts, white. See page 39. 



Section 4. Length, over 21 ; bill, under 2 ; underparts, not white. See page 40. 



Section 5. Length, under 21. See page 40. 

 GROUP 5. Wing, over 17 inches long. See page 40. 



SUBFAMILY STERNIN^E. TERNS. 



TAIL, USUALLY FORKED. 



GROUP 5. 

 GROUP 6. 

 GROUP 7, 



GROUP 1. 



GROUP 2. 



GROUP 3. 



GROUP 4. 



Wing, 11 to 13 inches long. 

 Wing, 13 to 17 inches long. 

 Wing, over 17 inches long. 



Wing, 5.50 to 7.50 inches long. See page 41. 

 Wing, 7.50 to 8.50 inches long. See page 41. 

 Wing, 8.50 to 9.50 inches long. See page 41. 

 Wing, 9.50 to 11 inches long. See page 41. 



See page 43. 



See page 43. 



See page 43. 



