450 DIOMEDEID^. 



under surface, under wing-coverts, and axillaries white ; a greyish- 

 black mark in front of the ej^e and extending over it, its edges not 

 sharply defined, but passing into pale grey, which spreads over the 

 face ; back, wings, and tail greyish brown, the interscapulary region 

 ashy : bill (skin) pale horn-colour ; legs and feet yellow. According 

 to Gould, the bill is " light vinous-grey or bluish horn-colour, except 

 on the culmen, where it is more yellow, particularly at the base ; 

 the mandible is surrounded at the base with a narrow belt of blacii, 

 which also extends on each side of the culmen to the nostrils ; base 

 of the mandible surrounded by a belt of rich orange, which extends 

 to the corners of the mouth ; feet bluish white ; irides brown." 

 Total length about 35 inches, wing 22, tail 9, biU from gape 6, 

 tarsus 3"7, middle toe 5*7, inner toe 4'9. 



Hah. Coast of Tasmania. 



The single specimen in the Collection is of larger dimensions than 

 either of those described by Gould and Ridgway. 



a. (S ad. sk. Coast of Tasmania. Gould Coll. (One of the 



types of the species.) 



2. Thalassogeron salvini. 



Diomedea cauta, Bnller, Trans. N. Zeal. Inst. vi. p. 217 (1878) (nee 

 Gould) ; id. op. cit. xxiv. p. 67 (1892) ; id. op. cit. xxv. p. 76 

 (1893) ; id. Birds N. Zeal. ed. 2, ii. p. 203 (1888) ; Cheeseman, 

 Tr. N. Zeal. hist. xxi. p. 125 (1889). 



Thalassogeron salvini, i?o^^«cA. Bull. Brit. Orn. Club, i. p. Iviii (June 

 1893) ; id. Ibis, 1893, p. 572. 



Diomedea salvini, Bidler, Tr. N. Zeal. Inst, xxvii. p. 122 (1895). 



Adult. Similar to T. cautus, but the head, except the forehead 

 and crown, greyer, the upper edge of the loral patch more clearly 

 defined, and contrasting strongly with the white forehead and 

 crown ; the bill much more slender, less elevated at the base, and 

 of a leaden colour ; tarsi and toes shorter. Total length about 38 

 inches, wing from carpal joint 22, tail 8'6, bill from gape 5-9, 

 from base of culmen 5-5, tarsus 3'6, middle toe 5-3, outer toe a 

 trifle shorter, inner toe 4-5. (Mus. W. Rothschild.) 



Hah. New Zealand Seas. 



a. Ad. sk. New Zealand. Hon. W. Rothschild [P.]. 



(A typical specimen.) 



3. Thalassogeron layardi. 



Allied to T. cautus and T, salvini. From the former it differs in 

 its more slender bill, shorter tarsus, and smaller feet ; from the latter 

 in its slightly smaller and narrower bill, shorter tarsus and toes, and 

 also its much whiter head and neck. Total length about 39 inches, 

 wing 22, tail 8-5, bill from gape 6, from base of culmen 5-4, tarsus 

 3'5, middle toe 5'04, outer toe a trifle shorter, inner toe 4"4, 



Hah. Cape Seas. 



a. Ad. sk. Cape Seas (E. L. Layard). Shelley Coll. 



(Type of species.) 



