HYPOTHETICAL LIST. 351 



A very distinct species, of which only one specimen has been ob- 

 tained, the alleged locality being the " northwest coast of America." 



FAMILY PHALACROCORACLLXE. 

 7. Fhalacrocorax perspicillatus PALL. 



Pallas's Cormorant. 



Phalacrocorax perspicillatus PALL. Zoog. Rosso-As. II. 1826, 305. 



[B 621, C 533, R 648, C 756.] 



Believed, on good evidence, to be now extinct, as it unquestionably 

 is in the locality (Bering Island) where originally discovered. Only 

 three specimens are known to exist in collections, one each being 

 in the St Petersburg!}, Leyden, and British Museums. Even if exist- 

 ing, it has no valid claim to a place in the North American fauna. 

 (C/. STEJN. Pr. U. S. Nat. Mus. VI. 1883, p. 65.) 



FAMILY ANATID^E3. 

 8. Chen cserulescens (LINN.). 



Blue Goose. 



Anas ccerulescens LINN. S. N. ed. 10, I. 1758, 224. 



Chen carulescens RIDGW. Pr. U. S. Nat. Mus. III. Aug. 24, 1880, 202. 



[B 564, C 479, R 590, C 694.] 



Possibly a race of C. hyperboreus (PALL.). (Cf. B. B. & R. Water 

 B. N. Am. I. 1884, 437 ; RIDGW. Auk, I. 1884, 240.) 



FAMILY ARDEID^S. 

 9. Ardea wuerdemanni BAIRD. 



Wurdemann's Heron. 



Ardea iviirdemanni BAIRD, B. N. Am. 1858, 669. 



[B 488, C 450, R 486, part, C 656, part] 



