19 



10. Tip of outer primary black in adult; bill black; wing about 10 



inches Bonaparte Gull. 



11. Back, wings, a.nd tail slaty; in summer head and under parts black, in 



winter white Black Tern. 



11. Back and wings pearl gray, crown more or less black (12) 



12. Small, wing about 6f inches; forehead white, crown and line 



through eye black, bill yellow in summer Least Tern. 



12. Medium, wing 9Jtoll} inches; crown wholly black, bill red in 



summer (13) 



12. Large, wing 14 to 17 inches; crown wholly black, bill orange (15) 

 13. Inner web of outer tail feather gray, outer web white; under parts pure 



white Forster Tern. 



13. Inner web of outer tail feather white, outer web gray; under parts gray- 

 ish (14) 



14. Bill red, tipped with black ; tarsus over /j inch ; tail .one-half length 



of wing Common Tern. 



14. Bill wholly red; tarsus under -^inch; tail two-thirds length of 



wing Arctic Tern. 



15. Primaries wholly blackish, silvery on outer web; tailless forked; larger. 



Caspian Tern. 



15. Primaries with inner two-thirds of inner web, except tip, white, the tip 

 and outer web frosty black Royal Tern. 



47. Larus marinus Linnaeus — Great Black-backed Gull. 



The only Nebraska record for this bird is Aughey's, he having ex- 

 amined .a dead specimen which some Winnebago Indians had shot on 

 the Missouri and brought to Dakota City in May, 1871. He states 

 that this was the only instance of its occurrence in Nebraska known to 

 him. Some doubt has been expressed as to the acceptability of this 

 record, but the bird winters regularly to the Great Lakes, and is so 

 well-marked in adult plumage by its slaty mantle and even in the 

 young by its very large size, that misidentification is hardly possible. 



51. Larus argentatus Bruennich — Herring Gull. 



A rather rare migrant. Aughey records two specimens, procured 

 from the Winnebago Indians in May, 1870. Since then other observ- 

 ers have recorded it from West Point, Lincoln, Omaha, Rockport, 

 Gresham, and Beatrice. Breeds from northern states northward. 



54. Larus delewarensis Ord — Ring-billed Gull. 



A common migrant. There is a strong probability of this bird 

 breeding in northern Nebraska, especially about the Cherry county 

 lakes, where J. M. Bates, J. S. Hunter, R. H. Wolcott, J. E.Wallace 

 and F. H. Shoemaker have, in several different seasons, found it to 

 be common throughout the summer, but as yet no one has found 

 a nest. Also recorded in July from along the Niobrara and Elkhorn 

 rivers. Appears in spring about April 1, and lingers in fall to October. 



