632 BIRDS OF THE REPUBLIC OF PANAMA PART 4 



there have been numerous sightings of this species from California, 

 Texas, and the Atlantic coast of North America.] 



[LARUS CIRROCEPHALUS Vieillot: Gray-hooded Gull, 

 Gaviota Cabecigris 



Larus cirrocephalus Vieillot, 1818, Nouv. Diet. Hist. Nat., 21, p. 502. (Brazil.) 



The Gray-hooded Gull is known in Panama from a single sight re- 

 port of a bird seen by M. Moynihan in nonbreeding plumage at a 

 sewer outlet into Panama Bay in Panama City on September 25, 1955 

 (Ridgely, 1976, p. 111). The nominate race breeds on the coast of 

 western Peru and from Bolivia and southern Brazil to northern Ar- 

 gentina; it ranges commonly north to Ecuador and northern Brazil. 

 Another race is found in Africa.] 



[LARUS PHILADELPHIA (Ord): Bonaparte's Gull, 

 Gaviota de Bonaparte 



Sterna Philadelphia Anonymous = Ord, in Guthrie's Geogr., 1815, 2nd. An. ed., 

 2, p. 319. (Near Philadelphia, Pennsylvania.) 



The Bonaparte's Gull has been seen twice in Panama; both were 

 immatures found in the Canal Zone. One was photographed by J. 

 Pujals at Coco Solo on December 26-29, 1972, and another was ob- 

 served at the Gatun Dam spillway on January 13, 1974, by C. Leahy 

 and Ridgely (Ridgely, 1976, p. 112). This species breeds in Alaska 

 and western Canada and winters mainly on the coasts of the United 

 States and Mexico and, in smaller numbers, in the West Indies.] 



[PHAETUSA SIMPLEX (GmelinJ: Large-billed Tern, 

 Gaviotm Piquigrande 



Sterna simplex Gmelin, 1789, Syst. Nat., 1, pt. 2, p. 606. (Cayenne.) 



The Large-billed Tern was first reported in Panama in 1973; more 

 recently one or two have been seen each year in the Caribbean Canal 

 Zone area (Ridgely, in litt.). The first recorded were 2 immatures 

 seen repeatedly and well photographed at Coco Solo, Canal Zone, from 

 June 15 to July 7, 1973 (J. Pujals, et al.) with 1 seen intermittantly 

 through December of that year at various localities along the Carib- 

 bean coast of the Canal Zone. On the Pacific slope 1 was well seen at 

 a fresh water pond near El Rincon, Herrera, on March 27, 1974, by 

 Pujals, Eisenmann, and Skutch (Ridgely, 1976, p. 113). This tern in- 

 habits the rivers and coastlines of South America, primarily east of the 

 Andes, and normally ranges as close to Panama as the Magdalena Val- 

 ley in northern Colombia.] 



