47 C) Mr. C. II. B. Grant on Birds collected in Argentina, 



winter, consorting- Avitli L. macidipennis in flocks of tliousands 

 and feeding largely on the carcases of dead stock. It can 

 be picked out from L. macuUpennis by its larger size and 

 darker colouring, and the call is also louder and harsher. 



272. Steucorarius crepidatus. 



Stercorarius crepidatus Saunders, Cat. B. xxv. p. 327. 



a. S imi«- Tuyu, Ajo. Feb. 21, 11)09. 



This specimen is moulting all over, except the wings. 

 Its occurrence apparently constitutes a new record for 

 Ai'gentina, this species not having, I think, been recorded 

 before south of Rio de Janeiro. It was met with chasing 

 some Gulls on the sea-coast. On Feb. 23, 1910, I saw a 

 very dark-plumaged Skua chasing a Gull on the coast close 

 to where the specimen was shot in the previous year, and on 

 the following day a browner specimen was observed ; I have 

 no doubt that both these birds were of this species, but 

 unfortunately I was unable to get a shot at them, 



Fam. PoniciPEDiD.E. 



273. iEcHMOpnoRUs majok. 



jEchmophorus major Av^. Orn. ii. p. 202; Ogilvie-Grant, 

 Cat. B. xxvi. p. 549. 



a, i. cj ? • I^os Ynglases, Ajo. Oct. 13, 1908. 



Both these specimens are in full breeding-di'ess. This 

 Grebe is not uncommon in the Ajo district, but is a rather 

 wary bird and therefore difficult to shoot. In habits and 

 appearance it resembles the larger European species. It 

 breeds in the district, though I did not succeed in finding a 

 nest. 



271. PoDICJPES AMERICANUS. 



Podiceps americanus Grant, Cat. B. xxvi. p. 524. 

 Podiceps rollandi Arg. Orn. ii. p. 204. 

 a. ^ ad. Los Ynglases, Ajo. Oct. 13, 1908. 

 h. $ ad. „ „ May 9, 1909. 



This is (piite the commonest Grebe in the Ajo district. 

 It is usually seen singly or in pairs on all the svaters ; 



