GEN. 311-314 OF KEY. 113 



605. COLYMBUS TORQUATUS BRUNN. 

 Loon; Great Northern Diver. 



605a. COLYMBUS TORQUATUS BRUNN., 



var. ADAMSII (Gray) Coues. 

 Yellow-billed 1.0011. 



606. COLYMBUS ARCTICUS L, 

 Slack-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. CLARKII (Lawr.) Coues. 

 Clarke's Grebe. 



609. PODICEPS CRISTATUS (L.) LATH. 



Crested Grebe. 



610. PODICEPS GRISEIGENA (BODD.) GRAY, 



var HOLBOLLI (Reinh.) Coues. 

 Red-necked Grebe. 



611. PODICEPS CORNUTUS (GM.) LATH. 



Horned Grebe. 



612. PODICEPS AURITUS (L.) LATH., 



var. CALIFORNICUS (Heerm.) Coues. 

 American ared Grebe. 



613. PODICEPS DOMINICUS (L.) 



St. I>omingro Grebe. 



CHECK LIST BIRDS. 8 



