ZooL.— Vol. II.] LOOMIS— CALIFORNIA WATER BIRDS. 355 



II. General Observations/ 



^chmophorus occidentalis. Western Grebe. — A few 

 individuals were all that were noted. 



Colymbus nigricollis. Eared Grebe. — Only one small 

 Grebe was seen, and it appeared to be this species. 



Gavia imber. Loon. 



Gavia pacifica. Pacific Loon, 



Gavia lumme. Red-throated Loon. — On my arrival 

 these three Loons were numerous upon the water. As they 

 had not been molested, they had become tame at the Mon- 

 terey wharf, paying little attention to the loungers or to the 

 fishermen going and coming in their boats. By May 5 all 

 the Loons had disappeared from the vicinity of Monterey 

 except stragglers, a northward movement having taken 

 place. Afterwards there were inroads of Gavia imber and 

 Gavia pacifica, but neither became as abundant on the 

 water as at the outset. Loiterers remained to the day of 

 my departure. Offshore there were migratory movements 

 — see preceding 'Bird Waves.' The last extensive one 

 occurred May 27, when numerous bands of black-throated 

 birds (chiefly Gavia pacijica) appeared from the south and 

 passed swiftly by, heading in a northwesterly direction ; off 

 Point Pinos the line of flight of the majority was several 

 miles at sea. Gavia lum?ne disappeared early, an adult 

 May 8, being the last positively identified. 



All the black-throated specimens secured of Gavia faci- 

 fica exhibited traces of the winter garb on the fore-neck. 

 Gavia imber was taken in similar transitional stage and in 

 full nuptial plumage. There were some individuals of both 

 species in worn winter plumage. They were found chiefly 

 on the water in the harbor, and were probably sickly birds. 

 Gavia lumme was also obtained in breeding attire. At 

 Tomales Bay a number of black-headed Gavia imber and 



1 Subspecific names are omitted; otherwise the nomenclature conforms to the 

 A. O. U. 'Check-List,' second edition and eighth and ninth supplements. 



