FAMILY PODICIPID^E. GKEBES. 



25 



WATER BIRDS. 



KEY TO THE SPECIES. 



FAMILY PODICIPIDTE. 



Qrebes. 



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



* Group 1. Wing, less than 6.50 inches long. 



Depth of bill at base of culmen, over .40. Tn summer: Bill, with black l)aii(l; throat, 

 black. 



In winter : Bill, without black baud; throat, white. 



Podihjmbus podiceps. Pied-billed Qrebe. Hell Diver. 



See No. 4. 



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

 brownish gray or buff-colored feathers behind the ejc ; crown, nape, and tliroat, l)laclv. 



In. winter: Plain colored, without black or buff ou head; upper plumage, gra^'ish black- 

 underparts, silvery white, often tinged with ash gray on throat and sides. 



C'oli/mims miritvs Horned Qrebe. 

 See No. 2. 



* Group 2. Wing, over 6.50 inches long. 



In summer : Crown, black; upper throat, gray; lower throat and lireast, chestnut rufous- 

 rest of underparts, silvery grayish white. 



In winter : No rufous brown ou throat or breast. Golymhus holhiylU. Holboell's Qrebe. 



See No. 1. 



* For directions for nieaeuremeiit, see page 9. 



