DIRECTORY TO BIRDS OF EASTERN NORTH AMERICA. 13 



1. HOLBOELL'S GREBE, C. HOI,BOEKLII. 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, fig. 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, 

 Fig. 5 broadening behind into long plumes ; 



j lower neck, and chest, reddish ; oth- 

 | er elongated head plumes, greenish 

 I black. Breeds chiefly north of the 

 ! U. S. ; migrates south in Oct. and 

 | Nov. ; winters from southern X. E. 

 to Fla. ; comes north in April ; com- 



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, with 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_ 9 B, a. 1. 



