OCEANODROMA 847 



with one or two very indistinct darker bars, and tipped with a more 

 decided slaty hue ; lesser wing-coverts and tertials darker greyish sooty 

 brown, the longer of the latter narrowly margined with paler ; middle and 

 greater wing-coverts and innermost secondaries light greyish brown, the 

 margins of the secondaries and approximate coverts sooty -blackish ; lower 

 rump light greyish brown (like large wing-coverts) ; upper tail-coverts and 

 tail dark greyish brown (much paler than remiges), each feather showing 

 a subterminal broad transverse spot of a darker shade of the same colour ; 

 bill and feet black. Total length (skin) about 9 inches, wing 6 -20, tail 378, 

 forked for 1'6, culmen 0'70, depth of bill through middle 0'20, tarsus I'lO, 

 middle toe with claw 1*12. 



Hob. Japan. 



Not having been able to examine a specimen of this Petrel, I 

 have, as before, been obliged to copy the description in the Brit. 

 Mus. Catalogue. Nothing appears to be on record respecting the 

 habits or nidification of this species. 



1163. SWINHOE'S PETREL. 

 OCEANODROMA MONORHIS. 



Oceanodroma monorhls (Svvinhoe), Ibis, 1867, p. 386 ; (David and Oust), 

 Ois. Chine, p. 515 ; Salvin, Cat. B. Br. Mus. x\v. p. 356, pi. ii. 



Ad. (China). Differs from 0. tristrami in being somewhat smaller ; 

 it lacks the lighter rump patch, and has the light-coloured wing area 

 more restricted, the tail less deeply forked and the primaries much less 

 short and pointed. Culmen 0'8, wing 6'0, tail 2 '9, the central feathers 0'7 

 shorter than the lateral ones, tarsus 0'9, middle toe 0*9, inner toe 0'7 inch. 



Hob. Coasts of China and Japan. 



Respecting the habits and nidification of this species I find 

 nothing on record, except that it is said to breed on the desert 

 islands north-east of Formosa. 



1164. FORK-TAILED PETREL. 

 OCEANODROMA PURCATA. 



Oceanodroma /wrcafo(Gmel.), Syst. Nat. i. p. 561 (1788) ; (Gould), Zool. 

 Voy. " Sulphur," p. 50, pi. 33 ; (Seebohm), B. Jap. Emp. p. 271 ; 

 Tacz. F. 0. Sib. 0. p. 1068 ; Eidgway, p. 70 ; Salvin, Cat. B. Br. 

 Mus. xxv. p. 357. 



g ad. (Kurile Islands). General colour bluish grey, the scapulars, 

 wings externally, and space below the eye black ; the outer tail-feathers 

 on each side with the outer web white nearly to the tip ; wing- coverts 



