32 NORTH AMEJiJCAy BIRDS. 



A'. Bill with a black band near tip. 



Adult : Mantle pale pearl-graj' (much as 

 iu L. anjentatus) ; bill greenish yellow, 

 crossed near end by a ver}- distinct black 

 band, the tip sometimes tinged with 

 orange; iris pale yellow, eyelids vermil- 

 ion-red; feet (in lile) palo yellow, some- 

 times tinged with greenish. Young : 

 Above bi'ownish dusky, the feathers 

 broadly bordered and otherwise varied 

 with pale graj-ish buCf or dull whitish ; 

 quills blackish, the shorter ones bluish 

 gray basally and tipped with white; tail 

 with basal half (or more) pale grayish, 

 the subterminal third (or more) blackish, 

 the tip narrowly white; lower parts 

 white, spotted along sides with gra3-ish 

 brown; bill blackish, paler toward base. 

 Length 18.00-20.00, wing 13.60-15.75, eul- 

 men 1.55-1.75, depth of bill at angle .50- 

 .65, tarsus 1.90-2.45, middle toe (without 

 claw) 1.30-l.CO. £'(/(75 2.39x 1-71. Hab. 

 Whole of North America, breeding far 

 northward ; south, in winter, to Cuba 



and Mexico 54. L. delawarensis 



Ord. Eing-billed Gull. 

 A'. Bill without black in adult. 



/. Graj- " wedge" on inner web of third 

 quill never tipped with white, and 

 not carried definitely farther than 

 tip of sixth, usually not much beyond 

 tip of seventh, quill. Adult: Mantle 

 pearl-gray (about intermediate in 

 shade between that of L. californicus 

 and L. arge7itatus) ; rest of plumage, 

 except quills, pure white. Young : 

 Head and neck soiled whitish, striped 

 with grayish brown ; back, scapulars, 

 and wing-coverts dull graj-ish brown, 

 margined with grayish white; basal 

 half of tail white, terminal half 

 blackish or duskj', narrowly tipped 

 with white; lower parts dull white, 

 spotted and otherwise marked with 

 dull bruwn. Downy young : " Cov- 



