BIRDS — PROCELLAEINAE THALASSIDROMA PELAGICA. 
831 
Oceanites, Keys. & Bias. 1 
THALASSIDROMA WILSONI, Bonaparte. 
Wilson's Stormy Petrel. 
Procellaria pelagica, Wils . Am. Orn. VII, 1808, 90 ; pi. Ix. 
Procellaria " oeeanica, Kuhl, Beitr. Zool. 1820 ; pi. x, f. 1." Gray. 
Thalassidroma wilsoni, Bon. Syn. 1828, No. 308.— Nutt. Man. II, 1834. 321- Aud. Orn. Biog. Ill, 1835, 486 ; 
V, 1839, C45.— Ib. Birds Am. VII, 1844, 223 ; pi. cccclx. 
Oceanites u-ilsoni, Bon. Cons. Avium, II, 1855, 199. 
g P . Ch. — The general color of the plumage is dark sooty brown ; primaries and tail blackish brown, the latter white at the 
base ; some of the outer secondaries and the secondary coverts grayish ash, ending with grayish white ; rump, sides of tho 
abdomen and exterior lower tail coverts, white ; bill black ; iris dark brown ; tarsi and feet black, with the webs yellow except 
at the margin. 
Length, 7j inches ; wing, 6; tail, J ; bill, £^ ; tarsus, If. 
Hub.— Off the Atlantic coast from the Gulf of Mexico to Baffins' Bay. 
This species is somewhat smaller than T. leachii, and more delicate in form_, the bill is much 
weaker ; it may readily he distinguished by the greater proportion of white on the under tail 
coverts and on the sides at the base of the tail, together with its much longer tarsi and yellow 
webs ; tail nearly even. 
List of specimens. 
Locality. 
Whence obtained. 
Original 
number. 
Coast of New York 
Geo. N. Lawrence 
1019 
1022 
Do 
do 
Atlantic ocean 
S. F. Baird 
Procellaria, Linn. 
THALASSIDROMA PELAGICA, Vigors. 
The Stormy Petrel; Mother Carey's Chicken. 
Procellaria pelagica, Linn. Syst. Nat. I, 17G6, 212.— Bon. Consp. Av. II, 1855, 196. 
Thalassidroma pelagica, Vigors, Zool. Jour. II, 1825, 405.— Bonap. Syn. 1828, Append. Note 27, No. 3.— Nutt. 
Man. II, 1834, 327.— Aud. Orn. Biog. IV, 1838, 310.— Ib. Birds Am. VII, 1844, 228 ; 
pi. cccclxi. 
"Procellaria melanonxjx, Nilsson." 
"Procellaria melitcnsis, Schembri." 
" Procellaria tenuirostris, minor, ferroensis, et albifasciata, Breiim." 
Sp. Ch. — Upper plum.ige grayish black, tinged with brown ; quill feathers black ; the secondary coverts are margined 
towards the end, externally, and at tho tip, with grayish white ; a band of white crosses the rump ; upper tail coverts white at 
the base, but broadly ending with black ; tail black with the basal part white for a short distance ; under parts sooty brown ; 
lower tail coverts white at the base; axillar feathers and some of the under wing coverts white at the end ; bill black ; iris 
dark brown ; tarsi and feet black. 
Length, 5| inches ; wing, 5 ; tail, 2| ; bill, ^ ; tarsus, J. 
Hob. — Atlantic ocean, banks of Newfoundland. 
1 Claws acute. 
