PACIFIC COAST AVIFAUNA No. 10 



2 - Ga via pacifica (Lawrence). 



PACIFIC LOON. 



Synonyms Colymbns pacificus; Colymbus arcticus var. pacificus. 



Status The only reason for including this species in a list of the birds of 

 Arizona lies in the fact that it is contained in Cones' "List of the Birds of Fort 

 Whipple" (i866a, p. 100). No specific instance of its occurrence is cited, how- 

 ever; in fact he does not even explicitly state that the species was found in the 

 region, and though it may occur in winter on the Colorado River, there is at pres- 

 ent no proof that such is the case. 



3. Lams occidentalis Audubon. 



WESTERN GULL. 



Status Recorded as seen commonly in midwinter along the Colorado River 

 from its mouth to a point forty miles south of Yuma (Price, 1899, p. 90). If no 

 mistake was made in identification the species may be found ranging up the river 

 to within the Arizona boundary. 



4. Larus heermanni Cassin. 



HEERMANN GULL. 



Status Seen by Rhoads, in winter, on the lower Colorado River, "as far 

 up as Yuma, Arizona" (Stone, 1905, p. 687). The improbability of the occurrence 

 demands the verification of specimens actually secured. 



5. Larus atricilla Linnaeus. 



LAUGHING GULL. 



Synonym Chroecocephalus atricilla. 



Status "Colorado River, particularly its lower portions. A specimen taken 

 over a hundred miles from any body of water, near the eastern border of the Ter- 

 ritory" (Coues. i866a, p. 99). This is the only Arizona record. 



6. Larus franklini Richardson. 



FRANKLIN GULL. 



Synonym Chroecocephalus franklini. 



Status "I am under the impression that 1 also saw Ch. franklinii about 

 twenty miles from the river near Fort Mojave" (Coues, i866a, p. 99). 



7. Branta bernicla glaucogastra (Brehm). 



BRANT. 



Synonym Bernicla brenta. 



Status Mentioned by Coues (1865!;;, p. 538) as occurring on the Gila River, 

 and by Woodhouse (1853, p. 102) as abundant in "New Mexico". Both state- 

 ments seem improbable. 



8. Guara rubra (Linnaeus). 



SCARLET IBIS. 



Status Known only from the record of a flock of seven or eight birds, sup- 

 posedly this species, seen at Rillito Creek, near Fort Lowell, September 17, 1890 

 (Brown, 18993, p. 270). 



