FOSSIL BIRDS. 405 



Gavia pusflla Shufeldt. 



Gavia pusilla Shufeldt, Trans. Conn. Acad. Arts Sci., XIX, Feb., 1915, 

 70, pi. XIII, fig. 106. 



Geologic age uncertain: Wyoming? 



Order COLYMBIFORMES. Grebes. 

 Family COLYMBIDAE. Grebes. 



Genus COLYMBUS Linnaeus. 



Colymbus Linnaeus, 8yst. Nat., ed. 10, I, 1758, 135. Type, by subs, 

 desig., Colymbus cristatus Linnaeus (Baird, Brewer, and Ridgway, 

 1884). 



Subgenus COLYMBUS Linnaeus. 

 Colymbus grisegena Boddaert. Holboell's Grebe. 



Colymbus grisegena Boddaert, Table PI. Enl., 1783, 55. 

 Modern form reported from Pleistocene: Fossil Lake, Oregon. 



Subgenus DYTES Kaup. 



Dijtes Kaup, Skizz. Entw.-Gesch. Eur. Thierw., 1829, 41. Tj^ie, by subs, 

 desig., Colymbus auritus Linnaeus (Gray, 1842). 



Colymbus auritus Linnaeus. Horned Grebe. 



Colymbus auritus Linnaeus, Syst. Nat., ed. 10, I, 1758, 135. 



Modern form reported from Pleistocene: Cavern deposits of Tennessee; 

 Seminole Field and Itchtucknee River, Florida; Fossil Lake, Oregon. 



Colymbus nigricollis (Brehm). Eared Grebe. 



Podiceps nigricollis C. L. Brehm, Handbuch Naturg. Vogel Deutschl., 

 1831, 963. 



Modern form reported from Pleistocene: Fossil Lake, Oregon. 



Colymbus oligoceanus Shufeldt. 



Colymbus oligoceanus Shufeldt, Trans. Conn. Acad. Arts Sci., XIX, Feb., 

 1915, 54. 



? Oligoeene (John Day): Lower Willow Creek, Oregon. 



