110 AVIFAUNA COLUMBIANA. 



243. ( — .) Oceanites oceanicus (Kuhl) Cones. Wilson's Petrel. 



Not in the original edition. We find among our memoranda one to 

 the eft'eet that a specimen of this species was taken here many years 

 ago, and was, at the time of writing, preserved in the Smithsonian. [828J 



244. (211.) Puffinus obscurus ? Shearwater. 



A Shearwater, probably this species, has been detected in the District. 



Order PYGOPODES: Rump-footed Birds. 



Family COLYMBID.E : Loons. 



245. (222.) Colymbus torquatus Briinn. Great Northern Diver; Loon. 

 Rare; occasionally seen on the river during the winter. [840] 



Fig. 100.— Loou. 



Family PODICIPEDID.E: Grebes. 



246. (223.) Podicipes griseigena holboelli (Ilcinh.) Cuius. American Red-necked 



Grebe. 



Not uncommon on the river during the winter mouths. [847] 



[Dele (224) P. cristatus, given in the original edition.] 



247. (225.) Podicipes comutus (Gm.) Lath. Horned Grebe. 



Common on the Potomac during the winter months. [848] 



248. (22G.) Podilymbus podicipes (Linn.) Lmw>: Pied-billed Grebe ; "Dipper"; 



" AVater-witcii ; " "Hell-diver." 



Abundant on the Potomac in winter, but we have not been able to 

 ascertain with precision the times of arrival and departure of this spe- 

 cies and of the three preceding ones. [852] 



