GEN. 311-314 OF KEY. 113 
605. COLYMBUS TORQUATUS Brunn. 
Loon; Great Northern Diver. 
605a. COLYMBUS TORQUATUS Brunn., 
var. ADAMSII (Gray) Coues. 
Wellow-billed Loon. 
606. COLYMBUS ARCTICUS L. 
Biack-throated Diver. 
606a. COLYMBUS ARCTICUS L., 
var. PACIFICUS (Lawr.) Coues. 
Pacific Diver. 
607. COLYMBUS SEPTENTRIONALIS L. 
Red-throated Diver. 
608. PODICEPS OCCIDENTALIS Lawr. 
Western Grebe. 
608a. PODICEPS OCCIDENTALIS Lawr., 
var. CLARKIL (Lawr.) Coues. 
Clarke’s Grebe. 
609. PODICEPS CRISTATUS (L.) Latu. 
Crested Grebe. 
610. PODICEPS GRISHIGENA (Bopp.) Gray, 
var HOLBOLLI (Reinh.) Coues. 
Bed-necked Grebe. 
611. PODICEPS CORNUTUS (Gm.) Latu. 
Hiocrmed &rebe. 
612. PODICEPS AURITUS (1.) Lartu., 
var. CALIFORNICUS (Heerm.) Coues. 
American Hared Grebe. 
613. PODICEPS DOMINICUS (L.) 
St. Domingo Grebe. 
CHECK LIST BIRDS. 8 
