180 Annals of the Carnegie Museum. 



Family LARIDTL Gulls, Terns. 



85. Chroicocephalus atricilla Linnaeus. 



Eleven specimens: Buritaca and Trojas de Cataca. 



Mr. Smith sent in a single specimen from Buritaca, September 19, 

 1899. It was quite common around the fishing village of Trojas de 

 Cataca, October 5—1 1 , 1913, at which date the adults shot were all in 

 winter dress, while one of the young birds was still in postjuvenal 

 moult. It was not met with at any other place except Cienaga, where 

 a few 7 were seen near the town. The specimens secured appear to be- 

 long to the smaller or typical race, as discriminated by Mr. Noble 

 (Bulletin Museum of Comparative Zoology, LX, 1916, 367), but there 

 is a great deal of individual variation in size, even among our north- 

 ern specimens from the Atlantic and Gulf coasts. 



86. Phaetusa chloripoda (Vieillot). 



Phcctusa chloripoda Ridgway, Bull. U. S. Nat. Mus., No. 50, VIII, 1919, 541 

 (Punto Caiman and Trojas de Cataca). 



Five specimens: Punto Caiman and Trojas de Cataca. 



This large tern was common along the narrow strip of beach be- 

 tween the ocean and the Cienaga Grande, but was seen fishing for food 

 only in the Cienaga, in the sheltered bays and inlets. Specimens are 

 precisely the same as Bolivian examples. 



87. Hydrochelidon nigra surinamensis (Gmelin). 



Six specimens : Trojas de Cataca and Tierra Nueva. 



The Black Tern was fairly common on the Cienaga Grande, six 

 specimens being secured on October 10 and 12, 1913, although it was 

 not seen along the sea-beach at Punto Caiman. Evidently the fish 

 offal thrown into the water was the attraction which drew the birds 

 to the vicinity of the fishing village of Trojas de Cataca. Here, as 

 elsewhere in tropical America, it is of course only a winter resident. 

 All the specimens secured proved to be adults just completing the 

 winter plumage by assuming new remiges and rectrices. 



88. Thalasseus- 7 maximus (Boddaert). 

 One specimen : Cienaga. 



A single immature Royal Tern was shot near the shore of the Cie- 



27 On the use of this generic term compare Oberholser, Proceedings U. S. 

 National Museum, XLIX, 1915, 517. 



