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1" I'ACIFIC COAST AVIFAUNA No. 10 



/. Larus Philadelphia fOrd). 



Bonaparte Gull. 



Synonym — Chroicocephalus Philadelphia. 



Status — Dr. Coues met with this species on the Gila River ( 1865b,, p. 538). 

 and on the Colorado River, between Forts Mohave and Yuma, in September, 

 1865 ( 1866c. p. 259), but it has not been observed in the region by any one since 

 that time. 



8. Sterna forsteri Xuttall. 



Fhrster Tern. 



Status — There is in the Museum of Vertebrate Zoology an adult male (no. 

 12616) taken May 4. 1910, at the mouth of the Gila River, the first definite record 

 for Arizona. The species was included in Cones' (1866a, p. 99) list of bird- 

 occurring on the Colorado River, but with no statement as to the time or manner 

 of its occurrence. 



9. Sterna hirundo Linnaeus. 



Common Tern. 



Status — There is, apparently, record of but a .single specimen of this species 

 from Arizona, one secured by Henshaw ( 1875b. p. 486) on the San Pedro River, 

 September 3, 1872. 



10. Hydrochelidon nigra surinamensis (Gmelin). 



Black Tern. 



Synonyms — Hydrochelidon Ussipes ; Hydrochelidon lariformis; Hydrocheli- 

 don nigra; Hydrochelidon surinamensis. 



Status — A rare migrant. 1 lenshaw secured it in southern Arizona in the 

 fall (see Henshaw. 1875b. p. 487; Saunders, 1896, p. 20), and Brewster (1883. 

 p. 36) has recorded one taken at Cienega Station. April 17. 



1 1 . Phaethon aethereus Linnaeus. 



Red-billed Tropjc-bird. 



Synonym — Phaethon anicricanus. 



Status- — One specimen taken by Breninger at Phoenix. April 10, 1905. This 

 bird is now in the collection of the American Museum of Natural History (cf. 

 Miller. 1910. p. 450). 



12. Anhinga anhinga (Linnaeus). 



Anhinga. 



Status — Herbert Brown met with this species near Yuma, during the 

 winter of 1905-06, when it appeared to be not uncommon. He also reports a single 

 specimen, a female, killed on the Santa Cruz River, near Tucson. September r2. 

 1803 ( T906. p. 2T7). These are the only records for the state. 



