OCEAXITES. 71 



wing G.OO, tuil 3.80 (forked for about 1.20), tarsus 1.00. 

 Hab. Coast of Peru. 



O. markhami (Sal v.). Markham's Petrel.' 

 (P. Wing less than 6.00 ; tarsus less than 1.00. 



Smokj- plumbeous, the wing-eoverts lighter and more brown, 



quills and tail dusk}-, rump and upper tail-covcrts asliy 



plumbeous; wing 5.30-5.40, tail 3.30-3.50 (forked for .70- 



.90), tarsus .80- 90. Hab. Coast of California. 



(fi.) 108. O. homochroa (Coces). Ashy Petrel. 



a'. Upper tail-coverts at least partly while. 



t'. Upper tail-coverts without black tips ; tail-feathers grayish at base ; uni- 

 form sooty, darker above ; upper tail-coverts white, usually more or less 

 mixed with grayish ; length 7.50-8.90, wing 6 00-6.30, tail 3.50-4.00 

 (forked for .80-.90), tarsus .90-.95 ; feet (including webs) entirely black. 

 Egg 1.33 X -97. Hub. Seas of the northern hemisphere. 



106. O. leucorhoa (Vieill.). Leach's Petrel. 



fc'. Longer upper tail-coverts broadlj- tipped with black ; tail-feathers cxten- 



sivel}- pure while at base ; bill and feet (including webs) entirely black ; 



wing 5.80-6.30. tail 3.00-3.15 (forked for .20-.30), tarsus .85-.90. Sab. 



Sandwich Islands. 



(7.) O. cryptoleucura EiDQW. Sandwich Island Petrel.^ 



Genus OCEAN ITES Ketserling & Blasius. (Page 56, pi. XVII., fig. 3.) 



S2)ecies. 



Common Characters. — Sooty blackish, lighter beneath, the tail and quills 

 nearly or quite black; upper tail-coverts white; tail even or slightly emarginate. 



fl'. Belly entirely dusky; webs of feet mostly yellowish; length about 7.00-7.25, 

 wing 5.70-6.20, tail 3.00-3.25, tarsus 1.30-1.35. Ifab. Cosmopolitan (ou the 

 high seas). 



109. O- oceanicus (Kuiil). Wilson's Petrel. 

 a". Belly white; webs of feet wholly dusky; wing 5.20-5.50, tail 2.25-2.35, tarsus 

 1.15-1.21. Hab. Coast of Cliili and north to the Galapagos Archipelago. 



O. gracilis (Elliot). Graceful Petrel.' 



Gents CYMODROMA Pidgw.vt. (Page 56, pi. XV., fig. 3.) 



Species. 



Common Characters. — Head, neck, breast, and upper parts dusky, varying 

 from brownish black to plumbeous, the feathers of back and scapulars sometimes 

 (in fresh plumage) margined terminally with ashy whitish. 



• Cymocliorea mnrkhami SALT., P. Z. S. 18S3, WO. 



» Cymochorea cryploleiiciira Rincff., Proc. U. S. Xat. .Mus. IT. 1SS2, .■!.37; Water B. X. Am. ii. 1SS4, 406. 

 ' Ttialauidroma graeilU Elliot, Ibis, Oct. 1859, 391. Oceanilea gracUia CocES, Pr. Ac. Nat. Sci. Phil. 

 1864, 85. 



