386 Mr. R. Swinhoe on Amotj Ornithology. 



and settled again at no great distance, when a charge of dust 

 fetched it. It was a Petrel, true enough, but with the body of 

 a nearly uniform sooty colour, and with only one opening to its 

 nose. But for this last character, I would place it under Bona- 

 parte's Thalassidroma melania (Consp. Av. ii. p. 19G), though 

 that species is described as having a very short tail. Gray^s 

 ' Genera of Birds ' gives the type of Thalassidroma with a 

 double nostril ; and I cannot find it anywhere stated that any of 

 the known species has only one nasal opening. In Procellaria 

 glacialis, however, I see this peculiarity occurs. I therefore 

 propose to bring forward our bird as 



Thalassidroma monorhis, sp. nov. 



Length 7*3 in. ; wing 6 in. ; tail 2'9 in. ; wing extending 

 beyond tail about '5 in. Iris rich brown. Bill black, nostril 

 with only one hole apparent at the end of the tube. In- 

 side of mouth flesh-colour. Tongue flat and broadly sagit- 

 tate, furrowed down the middle and on either side. Legs 

 black, the inner side of inner toe and both sides of middle toe 

 whitish near their bases. Tibia bare for nearly '34 in. ; tarse 

 nearly "92 in. ; middle toe and claw '83 in. Wings much 

 curved near the tip. Tail furcate, inclined upwards at its sides, 

 especially at the fork, and consisting of twelve rectrices, of 

 which the outer feather is '6 in. longer than the middle. Head 

 and neck deep ashy-grey, lighter on forehead and I'ound bill. 

 Upper parts sooty-brown, washed with grey, the scapulars and 

 upper tail-coverts having darker shafts. Lesser wing-coverts, 

 quills, and tail brownish-black, blacker on the two first. Greater 

 wing-coverts light greyish-brown, broadly margined with white. 

 Under parts deep soot-colour tinged with brown, blacker on 

 under-wing and under tail-coverts. The latter are as long as 

 the middle rectrices. The quills are white at their bases. It 

 had a strong musky odour, like the Albatros, and like that bird 

 was found to support two species of lice of the genera Lipeurus 

 (Nitzsch) and Docophoroides (Denny). 



On dissection the cluster of eggs showed this specimen to be 

 a female. Trachea broad and simple, with a pair of sterno- 

 tracheal muscles ; at the junction with the bronchi broad, and 

 peaked in front, without muscles. Bronchi short and broad, 



