FAMILY PODICIPID.E. GlfEBES. 



25 



WATER BIRDS. 



KEY TO THE SPECI 



PodUrmbua podi£^^ 



FAMILY PODICIPID/E. 



Grebes. 



Toes, four ; three in front, one behind, with lobate webs. 



* Group I. Wing, less than 6.50 inches long. 



Depth of bill at base of culmen, over .40. fn summer: IJill, willi blac-k hand; throat, 

 black. 



In luinter : Hill, without hlaok haiid; throat, white. 



PoOihjmlms podicpps. Picd-billed Qrebe. Hell Diver. 



See No. 4. 



Depth of bill at base of culmen, less than .40. In summpr : Two small tufts of 

 brownish j^raj^ or I)ult-coiore(l foathfrs hchiiid tlu; <'}<»; crown, nape, and tliroat, Mack. 



In winO'r : Plain colored, without black or buff on head; upper iiluinaijc, i>rayish black; 

 nndi'i parts, silvery whijc. ofrcn tinned with ash j;ray on throat and sides. 



Colymlms aitritns Horned Qrebe. 

 See Xo. 2. 



* Group 2. Wing, over 6.50 inches long. 



InKummrr: Crown, black; upper throat, j::ray ; lower throat and l)reast, chestnut rufous; 

 rest of undcrparts, silvery irrayisli white. 



Inirintrr: \o rufous l)i-own on throat or breast. Colymhns holhnlh'. Holboell's (irebe. 



Sec No. 1. 



* For illriM-Uiiiirt fur iiu-.-isiircmoiit, r^vc piiRP il. 



