154 Ross on the Mammals, Birds, and Eggs 



(Gaviae). 

 Family Phalacrocoracid^. 



Genus Graculus. 



168. Graculus dilophus, (Gray). — Double-crested Cormorant. Slave 



Lake. Rare. 



Family Pelecanid^. 

 Genus Pelecanus. 

 (Cyrtopelicanus.) 



169. Pelecanus erythrorhynchus, (Gmelin) (American Pelican). — N. to 



Big Island. Common 



Family Larid^. 

 (LestridinaB.) 



Genus Stercorarius. 

 IVO. Stercorarius pomarinus, (Temm). — Pomarine skua. Slave Lake. 



Very rare. 

 171. Stercorarius parasiticus, (Temm). — Arctic skua. N. to Fort Simp- 

 son. Rare. 

 tl72. Stercorarius parasiticus, var. Richardsonii. — Slave Lake. Rare. 



173. Stercorarius catarractes, (Temm.) — Slave Lake. Very rare. 



174. Stercorarius cejyp/iMs, (Brunn).-Buflfon's skua. N. to Lapierres & Co. 



Rare. 



(Larinas.) 



Genus Larus. 

 tl75. Larus glaucescens, (Licht). — Glaucus-winged Gull. Slave Lake. 



Abundant. ' 

 tl76. Larus argentatus, (Briinn). — Herring Gull. N. to Arctic Coast. 



, Abundant. 



tl77. Larus Calif ornicus, (Lawrence). — California Gull. Slave Lake. 

 Abundant. 



Genus Chroicocephalus. 



178. Chroicocephalus Philadelphia^ (Lawrence). — N. to Fort Simpson. 



Not rare. 



Genus Rissa. 



179. Rissa septentrionalis, (Lawrence). — Slave Lake. Common. 



(Sterninae.) 



Genus Sterna. 

 tl80. Sterna Caspia, (Pallas). — Caspian Tern. Slave Lake. Rare. 

 flSl. Sterna Wilsonii, (Bon). — Wilson's Tern. Slave Lake and Bear 



Lake. Rather rare. 

 tl82. Sterna macroura, (Naum). — Arctic Tern. N. to Bear Lake. Abun- 

 dant. 



Genus Hydrochelidon. 

 183. Hydrochelidon plumbea, (Wils). — Short-tailed Tern. Slave Lake 

 Rare. Numerous other species of the sub-family Lari 



I 



