830 U. & P. Ro R. EXP. AND SURVEYS—ZOOLOGY—GENERAL REPORT. 
The above is a copy of Mr. Gray’s description of this species; he states that ‘‘in form it 
agrees best with Thal. furcata, but the coloration differs much in several particulars.’’ 
Thalassidroma, Vigors. 
THALASSIDROMA LEACHII, Bon. 
Leach’s Petrel. 
Procellaria leachiit, Temm. Man. IJ, 1820, 812. 
T halassidroma leachii, Bon. Syn. 1828, No. 309.—Is. Consp. II, 1855, 193.—Nurr. Man. II, 1834, 326.—Avp. 
Orn. Biog. III, 1835, 434.—Is. Birds Am. VII, 1844, 219; pl. ececlix. 
Procellaria bullockii, FLem. Br. Anim. 1828, 136, No. 219.—Vicors 
2* Procellaria leucorrhoa, ViziLLot.’’ Bon. 
Sp. Cu.—The plumage generally is sooty brown, darker 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 coveris, white ; bill black ; iris dark 
brown ; tarsi and feet black. 
Length, 8 inches ; wing, 63; tail, 3; bill, 3; tarsus 1]. 
The female differs only in being rathe1 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. 
y 
Locality. | Whence obtained. Original No. 
ee 
Coast of New York-<-.--¢..-.-- | George N. Lawrence -.---- ----- 1018 
Atlantic coast=--~-s2s—-sssesee = |FSSHBaind wee wo cee ere oe eaiaesasooss 
Washington, D: (C22. 225 22=---- een 0 Sees secs ceeose- aa eae eer 
THALASSIDROMA MELANTIA, Bonaparte. 
The Black Stormy Petrel. 
Proceilaria melania, Bon. Comptes Rendus, Ac. Sc. XXVIII, 1854, 662. 
Thalassidroma melania, Bon. Cons. Av. II, 1855, 196. 
‘¢? Procellaria fuliginosa, Lar. Not of Kuhl.’? Bon. 
‘©? Procellaria scapulata, BRanpT.”” 
Sr. Ca.—Entire upper plumage black ; wing coverts wholly black ; below fuliginous; wings long ; tail short, but deeply 
forked. 
Hab .—Coast of California. 
It somewhat resembles Thal. 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, 
