8 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I3I 



Gaviella pusilla (Shufeldt) 



Gavia pusilla Shufeldt, Trans. Connecticut Acad. Arts Sci., vol. 19, Febru- 

 ary 1 91 5, p. 70, pi. 13, fig. 106. 



Probably from Oligocene (White River formation) : near Lusk, 



Wyoming.^ 



Order COLYMBIFORMES : Grebes 



Family COLYMBIDAE: Grebes 



Genus COLYMBUS Linnaeus 



Colymhus Linnaeus, Syst. Nat., ed. 10, vol. i, 1758, p. 135. Type, by subse- 

 quent designation, Colymhus cristatus Linnaeus (Baird, Brewer, and 

 Ridgway, 1884). 



Subgenus DYTES Kaup 



Dytes Kaup, Skizz. Entw.-Gesch. Eur. Thierw., 1829, p. 41. Type, by subse- 

 quent designation, Dytes cormitus Kaup =: Colymhus auritus Linnaeus 

 (Gray, 1842). 



Colymbus auritus Linnaeus: Horned Grebe 

 Colymhus auritus Linnaeus, Syst. Nat., ed. 10, vol. i, 1758, p. 135. 



Modern form reported from Pleistocene : Cavern deposits of Ten- 

 nessee; Seminole Field, Pinellas County, and Itchtucknee River, 

 Columbia County, Florida. ° 



Colymbus caspicus Hablizl: Eared Grebe 



Colymhus caspicus Hablizl, Neue Nordische Beytrage, vol. 4, 1783, p. 9. 



Modern form reported from Pliocene (Ogallala formation) : Edson 

 Quarry, Sherman County, Kansas. Late Pleistocene: Fossil Lake, 

 Oregon; San Pedro (Palos Verdes sand, lumberyard locality), Los 

 Angeles County, California; Meade County (Vanhem formation, 

 Jones fauna), Kansas. 



Colymbus oligoceanus Shufeldt 



Colymbus oligoceanus Shufeldt, Trans. Connecticut Acad. Arts Sci., vol. 19, 

 February 191 5, p. 54. 



? Oligocene (John Day) : Lower Willow Creek, Baker County, 

 Oregon. 



^ See Wetmore, A., Journ. Morph., vol. 66, Jan. 2, 1940, p. 30. 

 ° Specimens from Fossil Lake, Oregon, formerly included under this species 

 have been found by Hildegarde Howard to represent Colymhus caspicus and 



Podilymbus podiccps. 



