32 Field Museum op Natural History — Zoology, Vol. IX. 



.^feE^-~---, ■>r' 



Bill, flat, paddle shaped at the end; toes, four, 

 all on same level; wing (carpus to tip), over 

 twelve inches long. 



Family PLATALEID^. Spoonbills. 

 See page 75. 



GROUP 5. Toes, three, full webbed; no hind toe. 



Nostrils, separate, not opening into one double-barrelled tube; 

 upper mandible, curved near tip; bill, yellowish, or greenish yellow; 

 an indication of a hind toe, in the form of a small 

 knob without nail; tail, entirely white, or white 

 with black band near tip. This is the only North 

 American gull lacking a hind toe. 



Family LARID.^. Rissa tridactyla. 

 Kittiwake Gull. 

 See page 44. 



Murres. 



Mun«. 



Legs placed far back near the tail; bill, black or brownish; wing, 

 over 6.50 inches long, carpus (bend of wing) to tip. 



Family hLClDM. Auks and Murres. 

 See page 39. 



Size, small; tail, very short; bill, black or 

 brownish; wing, less than 6.50 inches long. 



Family ALCID.E. Murrelet, Dovekies, etc. 



See page 39. 



