436 PUFFINIDE. 
margine alari cinerascenti-brunneo marmorato ; remigibus intus cinerascentibus; axillaribus albis, apicem 
versus cinereo irroratis. Long. tota circa 11- 5, ale 7:0, caude 3:0, culm. 1° ca tarsi 1:5. (Deser. avis 
adult ex Montserrat I. Mus. nostr.) 
Hab. Coast of Eastern Nortu AMERICA, nesting on the Bahamas 4; GuLF or Mexico 5 §, 
Montserrat I. (Sturge 7). 
The question of the identity of the small Shearwaters (Puffinus 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 4. 
The present species differs from all the foregoing in its small size. 
We have not seen any specimens of P. auwduboni 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. 
PRIOCELLA. 
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 glacialoides, Smith, Ill. Zool. 8. Afr., Aves, p. 517. 
Priocella glacialoides, Baird, Brewer, & Ridgway, Water-Birds N. Amer. ii. p. 8373’; Salvin, Cat, 
Birds Brit. Mus. xxv. p. 393°; Sharpe, Rep. Southern Cross Coll. p. 145 *. 
Fulmarus glacialoides, A. O. U. Check-l. N. Amer. Birds, 2nd ed. p. 31°. 
Thalasseca glacialoides, Saunders, Antarctic Manual, p. 230°. 
Supra margaritaceo-cinerea, colore Larvno; uropygio et supracaudalibus vix pallidioribus; cauda pallide. 
margaritaceo-cinerea, rectricibus externis intus albis; ala spuria, tectricibus primariorum et remigibus 
plerisque extus nigricantibus intus cinereis basin versus albis ; primariorum pogonio interno pure albo, 
apicem versus nigricante; primariis interioribus extus cinereis, intus albis, ad apicem nigricantibus; 
secundariis intimis dorso concoloribus ; pileo pallide margaritaceo-cinereo ; fronte lata lorisque pure albis ; 
regione parotica alba vix cinereo lavata ; genis et corpore subtus toto pure ‘albis ; ; colli et corporis lateribus 
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 carneis, palmis carneis, digito externo saturatiore; iride brunnea, 
Long. tota circa 16:0, alee 12:0, caude 4°83, culm. 1°75, tarsi 1°38. (Descr. maris adulti ex Mazatlan. 
Mus. nostr.) 
