165 PROCEEDINGS OF THE ACADEMY OP 



Pseudoprion Banksii (Smith) Coues. 



Pachyptila Banksii, A. Smith, 111. S. Afric. Bds. pi. 55. 



Prion Banksii, Gould, Ann. Mag. N. H. 1844, xiii. p. 366. Gray, Gen. Birds, 



iii. 1849, p. 649. Bonaparte, C. A. 1855, ii. p. 193. 

 Procellaria Banksii, Schlegel, Mon. Proc. Mus. Pays-Bas, 1863, p. 17. 



Habitat. Antarctic regions, coming northward into temperate latitudes of 

 both Hemispheres. 



This species may be readily recognized by the continuation io the unguis of 

 the fringe of laminas, whereas in the others of the genus it is confined to a 

 short sp .ce near the base of the bill. The laminations are, however, very 

 small anteriorly ; and are somewhat deflected inwards. 



In colors the species of both Pseudoprion and I'rion are so nearly identical 

 that, compared with Prion vittatus, the present species seems to differ in hardly 

 aught else than in the less amount of blackish towards the tail. On the mid- 

 dle feathers it is about an inch in depth ; laterally decreasing so rapidly that 

 there is hardly a trace of it on the three outermost. The bill and feet, how- 

 ever, are differently colored. 



Dimensions. Bill (chord of culmen) a little more than one inch ; width at 

 widest point 0-50, height at base 044, at unguis about the same. Nasal tube3 

 18. Tarsus 1-25. Middle toe and claw 1-50, outer do. about the same ; inner 

 do. 1 25. Wing 7 50 to 8-00. Tail 400 ; its graduation about -75. 



Pseudoprion turtur (Banks) Coues. 



Procellaria turtur, "Banks icon. 15," and Solander's MSS. fide Bp. ? Kuhl, Mon. 



Proc. Beit. Zool. 1820, p. 143, No. 14, pi. xi. fig. 8. A. Smith, 111. Zool. 



S. Afric. Bds. pi. 54. Gray, Genera Birds, 1849, iii. p. 648. Schlegel, 



Mon. Proc. Mas. Pays-Bas, 1863, p. 17. 

 Prion turtur, Gould, Ann. Mag. N. H. xiii. 1844, p. 366. Introd. B. Aust. p. 



117, No. 602. Id. B. Aust. vii. pi. 54. Bonaparte, C. A. 1856. ii. p. 



193. 

 Habitat." Whole Pacific Ocean, between 30 and 50 of south latitude.'' 

 (Gould.) 



A species absolutely identical with P. Banksii in colors of plumage ; but 

 readily to be distinguished from that species by its somewhat smaller size, de- 

 cidedly slenderer and more compressed bill, and especially by the restriction 

 of the fringe of laminas to the base of the bill, and their very incomplete de- 

 velopment. The bill and feet are described as similarly colored with those of 

 Prion vittatus ; the webs flesh colored. The following measurements, particu- 

 larly of the bill, taken from a specimen in the Philadelphia Academy, are to be 

 compared with those of Banksii above given. 



Chord of culmen 1-00 ; width of bill at base 0-33 ; height at base 0-37; at 

 unguis the same. Nasal tubes 0-18 ; tarsus 1-15; middle toe and claw 1-45; 

 outer do. 1-50; inner do. 1-25. Wing 7-25; tail 3-50; its graduation 0-50. 

 ^Authors agree in identifying' the Pr. turtur of Banks' and Solander's ineditae 

 with the species beautifully figured by Mr. Gould under this name, and dis- 

 tinguished from Banksii by the characters given in the preceding pHragraphs. 

 Following the P. turtur in Bonaparte's Cons-pectus is given a " Pr. Rossi, 

 Gr. Mus. Britacn. ex Mar. antarcticis. Similis J'rioni turturi ;-sed minor, et 

 proportionibus diversis ; rostro latiore." I do not know what this can be ; 

 unless, as is quite probable, it indicates the Prion ariel, Gould. 



Pseudoprion ariel (Gould) Coues. 



? Procellaria turtur, Kuhl, Mon. Proc. Beit. Zool. 1820, p. 143, pi. xi. fig. 8. 



(Also of Lesson, according to Bonaparte.) 

 ? Procellaria velox, Banks, ic. ined. No. 16, fide Bp. 

 Prion ariel, Gould, " Proc. Zool. Soc." Ann. Mag. N. H. 1844. xiii. p. 366. 



Iutrod. B. Aust. p. 117. sp. 605. 



[May, 



