242 CYMODEOMA. 



white. Eecognisable by its long legs. In flight it seems invariably to cross the 

 waves at right angles, leaping from one to the other in the Petrel way, Petrel 

 being Peterel, or Little Peter, from the apostle who tried to walk on the water. 

 (J. 976. B. 1536.) 



Also 0. gracilis. 6". Similar to 0. oceanicus, but smaller, and the middle of abdomen 

 is white. West coast of S. America. 



Also the genus Oarrodia. With scutellse on tarsus distinct. One species — G. nereis, 6|", 

 legs and bill black, above greyish black, tail grey, broadly tipped with black, breast and 

 below white. Southern Ocean from Kerguelen Land to New Zealand and the Falkland Islands, 



Also the genus Pelagodroma. Grey Storm Petrels. With claws flattened and wide. First 

 primary much shorter than third. One species — P. marina, 8", the White-bellied or Frigate 

 Petrel, legs and bill black, above slaty brown, edged white. Forehead, eye-stripe, and below 

 white, tail brownish. Seas of southern hemisphere, ranging north to the Canary Islands and the 

 coast of Massachusetts. 



Also the genus Pealea. With claws flat and wide. First primary longer than third. One 

 species — P. lineata. Legs and bill blue-black. Above dark fuliginous. Upper tail-coverta 

 white with dark longitudinal and terminal lines. Upola Island. (6.M. Cat., xxv. 361-364.) 



Genus CYMODROMA. 



Nearly allied to Oceanites. Claws flattened, spade-shaped, and pointed at 

 the end. 



279. Cymodroma melanogaster. The Duset-vented Storm: Petrel. 



(? 8". Legs and bill black. Above blackish brown. Tail nearly even, bases- 

 of all rectrices except mid pair white. Abdomen in middle sooty black. Southern 

 Ocean, northwards to Bay of Bengal, and in the Atlantic to the Tropic of Cancer. 

 (B. 1537.) 



Also C. grallaria. 74". Legs and bill black. Above sooty black. Back and scapulars- 

 grey, edged white. Tail black, bases of lateral rectrices white. Southern seas, north to the 

 coast of Florida. 



Also with tail deeply forked : — C. albigularis, Sj". Legs and bill black. Above sooty black. 

 Throat, abdomen, and a narrow band across the rump white. S. Pacific Ocean. And C mces- 

 tissima. 9J". Legs and bill black. Entire plumage sooty black, Samoa Islands. 



Subfamily PEOCELLAKliNiE. 



Fourth toe shorter than third. Claws sharp and compressed. Tarsus covered in front with 

 hexagonal scutes. Secondaries, thirteen. Keel of sternum entirely ossified. 



The genus Procellaria. With tail rounded or nearly even. Two species — P. pelagica, 6J", 

 the Storm Petrel, legs and bill black, upper tail-coverts sooty black, rectrices sooty, white 

 at base, shafts black, N. Atlantic southwards to W. Africa and Mediterranean ; and P. tetlvySy 

 6", similar to P. pelagica, but upper tail-coverts wholly white, tail slightly forked, Galapagos. 



Also the genus Halocypteria. With tail cuneate. One species — H. microsoma, BJ", legs- 

 and bill black, sooty black, forehead and below brown. Lower California to Panama. 



Also the genus Oceanodroma, With tail distinctly forked. Twelve species : — 



0. leucorrhoa. 8". The Fork-tailed Storm Petrel. Legs and bill black. Head and throat 

 grey. Upper tail-coverts more or less white. Bases of lateral rectrices black. Longest upper 

 tail-coverts white, narrowly tipped sooty. Seas of northern hemisphere. 



0. cryptoleucura. 7". The Madeira Storm Petrel. Similar to 0. leucorrhoa, but longer 

 upper tail-coverts, broadly tipped black. Hawaiian and Galapagos Islands. S. Atlantic, 

 and as far north as Madeira. 



0. macrodactyla. 8J". Similar to 0. leiieorrhoa, but tail longer and more deeply forked,, 

 and upper tail-coverts tipped dusky. Lower California. 



0. soccorroensis. 6i". Similar to 0. leucorrhoa, but upper tail-coverts chiefly greyish 

 white (producing a distinct spot on each side of rump). Coast of Mexico. 



