( 55 ) 

 195. Sterna fluviatilis Naura. (an subsp. ?). 



Slfrmifliiviiililis Naumann, Isin 1819. p. 1848 (no locality). 



A single ? from Seelet, March, 



The form inhabiting the tropical portions ofSonth America is perhajis separable 

 as a subspecies. (Cfr. Hartert, Ibis 1893. p. 309.) 



lOCi. Phaetusa magnirostris (Lciit.). 



Steriiii miii/iiirot/ris Lichtenstein, Verz. Dubl. p. 81 (1823 — Brazil). 



Three immature ? ? from Port of Spain, .June, agreeing with mainland 

 specimens in corresponding plumage. 



197. Ryiichops nigra cinerascens Spix (?) 



[_Ri/nrlinj)s nigra lAnntiens, SysL Naf. x. p. 1.^8 (1758: "in America." — We accept Carolina (ex 



Catesby) as typical habitat).] 

 R. cinerascens Spix, Av. Bras. ii. p. 80. tab. cii. (1825 : " in locia ripariis Hum. Ama-imnm "). 

 R. melanuru auct. 



One nearly adult S and two young birds marked c? and ? from Port of Spain, 

 Juno. 



The specimen in most advanced plumage agrees with the adult male from 

 Caicara, Orinoco, spoken of by Berlepsch and Hartert,* in having pale wliitish ashy 

 under wing-coverts and broad white tips to the secondaries. An adult bird from 

 Manaos, Amazons, which doubtless represents typical i?. cinerascens, has much 

 darker, smoky brown under wing-coverts, and very narrow whitish apical 

 margins on the secondaries. One S from Cumanji is quite similar, and therefore 

 I doubt the possibility of separating the Venezuelan form as a dilferent subspecies. 



198. Larus atricilla Linn. 



Lnriis atricilla Linnaeus, Sijst. Nat. x. p. 1.3G (1758 : " in America," sc. Carolina — ex Catesby). 



One pair of adults and one immature c?, all obtained at Port of Spain 

 harbour, June 1903. Mr. Andrd sent also a good series from Tobago. 



II.^LIST OF THE SPECIES OCCURRING ON THE ISLANDS OF MONOS 

 AND CHACACHACARE, BUT NOT FOUND ON TRINIDAD. 



Unfortunately, we know as yet very little about the ornis of the small islands 

 lying between Trinidad and the Paria peninsula. It is not improbable that some of the 

 sj)ecies treated of in the next chapter might yet be discovered on one of these islets. 

 So far as I am aware, the only naturalists who ever visited them were Chapman and 

 Taylor. The former collected several birds on Monos Island, the latter spent a few 

 days on Chacachacarc. Both collectors obtained a number of species which have 

 never been taken on Trinidad, but are common residents on the opposite coast of 

 Venezuela. 



* Aia: Ximl. ix. (1302) p. \?.2. 



