BiKDS OF Indiana. 569 



V. Family LARID^. Gulls and Tekns. 



o' Bill more or less hooked; general color chiefly white with a darker bluish-gray 

 or slaty mantle. Subfamily LabiN2E. Gulm. 



6'. Hind toe rudimentary or wanting, with minute claw or none. KissA. 

 6^. Hind toe small, but with perfect claw. 



c^ Tail even. Larus. 6 



c2. Tail forked. Xema. 



o^. Bill not hooked, but narrow and pointed, the mandibles even; tail (in our 

 species), deeply forked. Subfamily Sternin^. Teens. 



d^. Tail much more than one-third length of wing, its outer feathers narrow 

 and pointed; toes well webbed, 

 e'. Bill stout, its depth at base equal to one-third length of culmen. 



Gelochelidon. 

 e^. Bill slender, its depth at base not one-third its length. Sterna. 7 

 d^. Tail little more than one-third wing; its outer feathers broad and 

 rounded. Hydrochelidon. 8 



Subfamily LARIN.E. Gulls. 

 6. Gbnus LAEUS Link^us. 



Bill of a Gull mach reduced, 

 o'. Length over 18. 

 6^. Priniaries without black; pearl-gray, fading gradually into white at tips, 

 c'. Wing over 16.50. L. glaucus Briinn. 9 



c^. Wing 16.50 or less. Ii. leucopterus Faber. 10 



b'. Primaries crossed with black; shafts of primaries black in the black mark- 

 ings. 



d'. Length over 22. ; white tips of outer primary separated from the other 

 white by band of black. L. axgentatus smithsonianus Coues. 1 1 

 d^. Length 20. or less. L. delawarensis Ord. 12 



a'. Length under 16. 



e'. Bill and feet reddish ; wing over 11. L. franklinii Sw. & Rich. 13 

 e'. Bill black ; feet red or yellow ; wing under 11. 



L. Philadelphia (Ord). 14 



9. (42.) Larus glaucus Brunn. 



Glaucous Gull. 

 Synonym, Burgomaster. 



Adult. — "Plumage, pure white, except the mantle, which is grayish- 

 blue; bill, gamboge yellow, with a carmine patch toward the end of 



