140 
allen’s naturalist’s library. 
taken in the hand it disgorged a few drops of amber-coloured 
oil, and m none did we find any solid matter in the stomach.” 
Nest. — None, or consisting only of a few blades of dead grass. 
The eggs are laid in May and some are even found as late as 
September, so that the Storm-Petrel probably raises two 
broods in the year. 
Eggs. — One only.* Dull or dirty white, without gloss, thinly 
sprinkled with minute reddish-brown specks, and not un- 
frequently with an obscure zone of specks near the larger end. 
Axis, i'05-i' 2 inch; diam., o'85-o'95. 
THE FORK-TAILED FETRELS. GENUS OCEANODROMA. 
Oceanodroma, Reichenb. Av. Syst. Nat. p. iv. (1852). 
Type, O. furcata (Gm.) 
In this genus the tail is always distinctly forked, and, further- 
more, the tarsus is shorter and never exceeds the length of the 
middle toe and claw. 
Twelve species of Oceanodroma are known, and the genus is 
found all over the tropics. 
I. THE FORK-TAILED STORM-PETREL. OCEANODROMA 
LEUCORRHOA. 
Procellaria leucorrhoa, Vieill. N. Diet. d’Hist. Nat. xxv. p. 422 
(1817) ; B. O. TJ. List Brit. B. p. 196 (1883), 
Thalassidroma kacht, Macgill. Brit. B. v. p. 451 (1852). 
Thalassidroma leucorrhoa, Dresser, B. Eur. viii: p. 497 pi. 613 
Cymochorea leucorrhoa, Saunders, ed. Yarrell’s Brit. B. iv 
p. 392 (1884). 
Procellaria leachi, Seebohm, Hist. Brit, B. iii. p. 443 (1885). 
Oceanodroma leucorrhoa, Saunders, Man. Brit. B. p. 725 (1889); 
Salvin, Cat. B. Brit. Mus. xxv. p 348 (1896). 
{y/au CXIb.) 
Adult Male. — General colour above sooty-black, with more 
or less of an ashy or slaty-grey shade, especially on the head ; 
* Sir Ralph Payne-Gallwey speaks of the Petrel hatching her three 
white eggs 1 (Cf. Turle, Ibis., 1891, p. n.) 
