830 



U. S. p. R. E, EXP. AND SUEVETS — ZOOLOGY — GENEEAL EEPOET. 



The atove is a copy of Mr. Gray's description of this species ; he states that " in form it 

 agrees best with Tlial. furcata, but the coloration differs much in several particulars." 



Thalassidroma, Vigors. 

 THALASSIDEOMA LEACHII, Bon. 



Leach's Petrel. 



Procdlaria leachii, Temm. Man. II, 1820, 812. 



Thalassidroma leachii, Bon. Syn. 1898, No. 309.— Is. Consp. II, 1855, 193.— Ndtt. Man, II, 1834, 326.— Ann. 



Orn. Biog. Ill, 1835, 434.— Ib. Birds Am. VII, 1844, 219 ; pi. cccclix. 

 Procellaria bullockii, Flem. Br. Anim. 1828, 136, No. 219. — Vigors 

 ? " Procellaria Uucorrhoa, Vieillot." Eon. 



Sp. Cb. — The plumage generally is sooty brown, darkor on the crown ; primaries and tail brownish black ; wing coverts and 

 inner secondaries ashy gray ; rump, feathers of the sides adjoining it, and outer lower tail covens, white ; bill black ; iris dark 

 brown ; tarsi and feet black. 



Length, 8 inches ; wing, 6j ; tail, 3 ; bill, | ; tarsus 1. 



The female differs only in being rather smaller. 



Hab. — Atlantic coast from Massachusetts to Baffin's Bay. 



This is larger than "Wilson's petrel, and has a much stronger bill ; it may be readily known 

 from it by its forked tail, and the interdigital webs being entirely black. 



List of specimens. 



THALASSIDEOMA MELANIA, Bonaparte. 



The Black Stormy Petrel. 



Procellaria me.lania, Bon. Comptes Rendus, Ac. Sc. XXVIII, 1854, 662. 

 Thalassidroma melania, Bon. Cons. Av. II, 1855, 196. 

 "? Procellaria fuliginosa, liATU . NotofKuhl." Bon. 

 " ? Procellaria scapulata, Brandt." 



Sp. Ch. — Entire upper plumage black ; wing coverts wholly black ; below fuliginous ; wings long ; tail short, but deeply 

 forked . 

 Hail. — Coast of California. 



It somewhat resembles Thai, leachii, but is distinguished from this as well as all its congeners 

 by the absence of white on the rump, crissum, and on the wing coverts. 



