FAMILY LARIDZE. -— GULLS AND TERNS. 3d 
FAMILY LARID. 
GULLS AND TERNS. 
SUBFAMILY LARINA. GULLS. 
TAIL, USUALLY NEARLY SQUARE. 
Group 1. Wing, 9.50 to TL 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 3s. 
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 pave 39. 
Section 8. Length, over 215 bill, under 2; underparts, white. See page 389. 
Section 4. Length, over 215 bill, under 2; underparts, not white. See page 40, 
Section 5. Length, under 21. See page 40. 
GROUP 5. Wing’ 
Sp? 
over 17 inches long. See page 40. 
SUBFAMILY STERNINE. TERNS. 
TAIL, USUALLY FORKED. 
GRouP 1.) Wing, 5.50 to 7.50 inches long. See page 41. 
bo 
Group 2. Wing, 7.50 to 8.50 inches long. See page 41. 
~ 
Group 8. Wing, 8.50 to 9.50 inches long. See page 41. 
Group 4. Wing, 9.50 to 11 inches long. See page 41. 
Group 5. Wing, 11 to 18 inches long. See page 43. 
GRouP 6. Wing, 18 to 17 inches long. See page 43. 
Group 7, Wing, over 17 inches long. See page 43, 
Pp? 
