436 PUFFIXID.E. 



margine alari cinerascenti-brunneo mannorato ; remigibus infcus cineraseentibus ; axillaribus albis, apicem 

 versus cmereo irroratis. Long, tota circa 11"5, alas 7'0, caudae 3'0, culm. 1-15, tarsi 1-5. (Descr. avis 

 adultae ex Montserrat I. Mus. nostr.) 



Hob. Coast op Eastekx Xorth America, nesting on the Bahamas * ; Gulf of Mexico ^ ^, 

 Montserrat I. [Sturge ''). 



The question of the identity of the small Shearwaters (Fuffinus obscurus and its 

 allies) is admittedly a very difficult one, and in the ' Catalogue of Birds ' Salvin 

 recognized three species only — P. obscurus, P. assimilis, and P. auricularis, while 

 Messrs. Rothschild and Hartert distinguish seven forms. It is not necessary in the 

 present work to discuss the validity of the latter, and I must refer those interested in 

 the subject to the elaborate paper above quoted ^. 



The present species differs from all the foregoing in its small size. 



We have not seen any specimens of P. auduboni from the Gulf of Mexico, whence 

 Dr. Elliott Coues has recorded it. 



Mr. Bonhote found this Shearwater extremely common on the Cays of Andros I., in 

 the Bahamas, breeding in May. 



PEIOCELLA. 

 Priocella, Hombr. & Jacq. C. R. xviii. p. 357 (1844) ; Salvin, Cat. Birds Brit. Mus. xxv. p. 393 

 (1896). 



The genus Priocella has the same compressed tarsus as Puffinus, but the nasal tubes 

 are placed higher in the bill, and are united in a single opening directed forwards. 



One species only is known, inhabiting chiefly the southern oceans, but occasionally 

 wandering northward into equatorial and temperate latitudes. 



1. Priocella glacialoides. 



Procellaria gladaloides, Smith, 111. Zool. S. Afr., Aves, p. 51 '. 



Priocella glacialoides, Baird, Brewer, & Ridgway, Water-Birds N. Amer. ii. p. 373 ° ; Salvin, Cat. 



Birds Brit. Mus. xxv. p. 393 ' ; Sharpe, Rep. Southern Cross Coll. p. 145 *. 

 Fulmarus glacialoides, A. O. U. Check-1. N. Amer. Birds, 2nd ed. p. 31 °. 

 Thalassaca glacialoides, Saunders, Antarctic Manual, p. 230°. 



Supra margaritaceo-cinerea, colore Larino ■ uropygio et supracaudalibus vix pallidioribus ; cauda pcJlide 

 margaritaceo-ciuerea, rectrieibus externis intus albis ; ala spuria, tectricibus primariorum et remigibus 

 plerisque extus nigricantibus intus cinereis basin versus albis ; primariorum pogonio intemo pure albo, 

 apicem versus nigricante ; primariis interioribus extus cinereis, intus albis, ad apicem nigricantibus ; 

 secundariis intimis dorso concoloribus ; pUeo paUide margaritaceo-cinereo ; fronte lata lorisque pure albis ; 

 regione paretics alba vix cinereo lavata ; genis et corpore subtus toto pure albis ; colli et corporis lateribns 

 pallide cinereo lavatis ; subcaudalibus, subalaribus et axillaribus pure albis ; margine alari nigricante vel 

 cinereo lavato ; remigibus intus albis : rostro flavicante, apice et culminis parte mediana, naribus et 

 maxilla basali, nigris ; pedibus pallide cameis, palmis carneis, digito extemo saturatiore ; iride bmnnea. 

 Long, tota circa 16-0, al;e 12-0, caudae 4"3, culm. 1-75, tarsi 1-S. (Descr. maris adulti ex Mazatlan. 

 Mus. nostr.) 



