BIEDS — PEOCELLAEINAE — THALASSIDEOMA PELAGICA. 



831 



Oceanites, Keys. & Blas.^ 

 THALASSIDEOMA WILSONI, Bonaparte. 



Wilson's Stormy Petrel. 



Procellaria pelagica, Wils. Am. Orn. VII, 1808, 90 ; pi. Ix. 



Procellaria " oceanica, Kohl, Beitr. Zool. 1820 ; pi. a, f. 1." Gray. 



Thalassidroma wilsoni, Bon. Syn. 1828, No. 308.— Ndtt. Man. II, 1834, 324.— Add. Orn. Biog. Ill, 1835, 486 ; 



V, 1839, 645.— Ib. Birds Am. VII, 1844, 223 ; pi. cccclx. 

 Oceanites wilsoni, Bon. Cons. Avium, II, 1855, 199. 



Sp. 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 the 

 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, 7^ inches ; wing, 6 ; tail, I ; bill, ^ ; tarsus, If. 



Hab. — Off the Atlantic coast from the Gulf of Mexico to Baffins' Bay. 



This species is somewhat smaller than T. leacJiii, and more delicate in form^ the bill is much 

 ■weaker ; it may readily be 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. 



Procellaria, Linn. 

 THALASSIDROMA PELAGICA, Vigors. 



The Stormy Petrel; Mother Carey's Chicken. 



Procellaria pelagica, Linn. Syst. Nat. I, 1766, 212. — Bon. Consp. Av. II, 1855, 196. 



Thalassidroma pelagica, Vigors, Zool. Jour. II, 1825, 405. — Eonap. Syn. 1828, Append. Note 27, No. 3. — Nutt. 



Man. II, 1834, 327.— Aud. Orn. Biog. IV, 1838, 310.— Is. Birds Am. VII,. 1844, 228 ; 



pi, cccclxi. 

 "Procellaria melanonyx, Nilsson. " 

 "Procellaria melitensis, Schembri." 

 " Procellaria temiirostris, minor, ferroensis, et albifascinta, Brehm." 



Sp. Ch.— Upper plumage grayish black, tinged with brown; quill feathers black; the secondary coverts are margined 

 towards the end, externally, and at the 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, 5J inches ; wing, 5 ; tail, 2i ; bill, j^ ; tarsus, |. 



Hab. — Atlantic ocean, banks of Newfoundland. 



' Claws acute. 



