:)lKE(.TOKY TO lilKDS OF EASTERN NORTH AMERICA. 



13 



1. HOLBOELL'S GREBE, C. hoeboellii. Largest of 

 our grebes ; bill, yellowish. In summer, neck reddish with 

 short plumes. Breeds in the Arctic regions: found along 

 the coast in autumn and winter, sometimes on fresh waters. 

 Oct. 15 to May 15. Rather common. 



b. Short-billed Grebes. Dytes. 

 Bill, less than twice as long as deep, lig. 5. Size, small, 

 12.00-14.00. Also differs from a in having the breeding 

 plumes long and conspicuous. 



1. HORNED GREBE, D. auritus. Smaller than a, 1, 

 but similar in color in winter. In summer, line through eye, 



broadening behind into long plumes ; 

 lower neck, and chest, reddish ; oth- 

 er elongated head plumes, greenish 

 black. Breeds chiefly north of the 

 U. S. ; migrates south in Oct. and 

 Nov. ; winters from southern N. E. 

 ^, A, b, 1 '^ to Fla. ; comes north in April ; com- 

 mon. 

 B. THICK-BILLED GREBES. Podilymbidae. 

 Bill, thick, shorter than twice its depth, fig. 6; no white 

 patch on wing ; no special head plumes. Occur mostly on 

 fresh waters. 



a. Black-throated Grebes. Podilymbus. 

 Throat, Avith a conspicuous black patch in the summer. 

 Male larger than the female and probably polygamous. 



1. PIED-BILLED GREBE, P. podiceps. Male, 15.00; 

 female, 12.00. In summer, bill, bluish white with a black 

 band crossing middle, fig. 6; dark- Fig. 6 



brown above, lighter on sides of 

 head and neck, and lower neck in 

 front; silvery white beneath with 

 obscure spots of dusky. In winter, 

 throat, white ; bill, brown without 

 band, and there are no spots on the 

 white beneath ; neck, decidedly red- A., B, a. 1. 



