16 PACIFIC COAST AVIFAUNA No. 7 



(Beck, Proc. Cal. Acad. Sci.. ser. 4, vol. iii, 1910, 64), it is probably of more or 

 less regular occurrence along our whole coast. So far as I know, only one speci- 

 men has been recorded from southern California, an adult male taken by H. W. 

 Marsden at Pacific Beach, San Diego County, September 21, 1904 (Bishop, 

 Condor vii, 1905, 31) ; now no. 11683, collection of Louis B. Bishop. 



33. (69) Sterna forsteri Nuttall. Forster Tern. 



Common along the coast and on inland lakes and ponds in fall, winter and 

 spring. Occasional during the summer. Most abundant along the Los Angeles 

 County coast in the fall from September 1 to October 20, and in the spring from 

 March 10 to May 15. I saw several birds at Nigger Slough, Los Angeles 

 County, May 25, 1907, and E. Heller found them common at Elsinore Lake, 

 Riverside County, June 2, 1896 (Condor in, 1901, 100). J. Grinnell noted them 

 daily at Bear Lake in the San Bernardino Mountains, from July 28 to August 2, 

 1905 (Univ. CaHf. Publ. Zool., v, 1908, 52). Although the Forster Tern has 

 been reported as breeding in southern California, I know of no authentic records. 



34. (70) Sterna hirundo Linnaeus. Common Tern. 



This species on sight being so easily confused with the last, its comparative 

 abundance is difficult to determine accurately, but it is probably a regular migrant 

 along our coast in limited numbers. The fall migration appears to take place 

 principally in September and the spring migration in May. A. B. Howell and J. 

 H. Bowles found the Common Tern fairly plentiful at Santa Barbara during Sep- 

 tember, 1911. C. B. Linton took five specimens at Alamitos Bay, Los Angeles 

 County, September 25, 1907 (Willett, Condor x, 1908, 50). H. W. Marsden took 

 three adult males at Pacific Beach, San Diego County, September 8, 12 and 15, 

 1904 (Bishop, Condor vii, 1905, 31). I took a pair of adults from a flock of 

 fifteen or twenty liirds that were feeding around the Los Angeles out-fall sewer 

 at Hyperion, May 24, 1910 (Condor xii, 1910, 174). 



35. (71 ) Sterna paradisaea Briinnich. Arctic Tern. 



Occurs along the coast during migrations. H. S. Swarth took a male at 

 Terminal Island, Los Angeles County, October 30, 1901, and F. S. Daggett 

 took three specimejis near San Pedro, September 13, 1902 (Condor v, 1903, 17). 



36. (74) Sterna antillarum (Lesson). Least Tern. 



Common summer resident along the coast. Arrives in April and leaves 

 mostly in September. Xests in suitable localities along the sandy beaches. Eggs 

 are generally deposited in June and July. There are substantial breeding colo- 

 nies at Hueneme, F'laya del Rey, Sunset Beach, Newport and Pacific Beach. 

 Evan Davis has found fresh eggs at Newport, Orange County, as early as May 

 20 and as late as August 12 (Grinnell, Pub. 2, Pasadena Acad. Sci., 1898, 8). 



37. (77) Hydrochelidon nigra surinamensis (Gmelin). Black Tern. 

 Common migrant along the coast and on inland lakes and ponds. I found 



this species abundant at Hyperion, Los Angeles County, from August 20 to Sep- 

 tember 10, 1910; and the birds were plentiful at Nigger Slough, Los Angeles 

 County, from April 22 to May 9, 1910, a few remaining as late as May 18. 

 E. Heller observed the Black Tern at Elsinore Lake, Riverside County, June 



