174 ON THE EXPEDITION UP THE RIO PILCOMAYO. [Mar. 1, 



In the plumage of the lores our birds are not quite so different 

 as would appear from Taczanowski's description above referred 

 to ; probably these differences vary according to age or sex. Both 

 our birds have the lores delicately feathered, but the bristle-feathers 

 of H. bi'anickii are lighter than those of S. pelagicus. 



H. petagicus and H. hranickii are the largest of all the Eagles. 

 Both our birds live, together with many other Eagles and birds of 

 prey, in a large cage of our Eagle-house. When at rest they are 

 generally to be seen sitting close together ; their cry is in corre- 

 spondence with their giant size, much louder and more penetrating 

 than that of all the other Eagles. 



March 1, 1892. 

 Dr. A. Giinther, F.R.S., Vice-President, in the Chair. 



The Secretary read the following report on the additions to the 

 Society's Menagerie during the month of February 1892 : — 



The total number of registered additions to the Society's Mena- 

 gerie during the month of February was 84, of which 37 were 

 by presentation, 7 by birth, 30 by purchase, 4 were received in 

 exchange, and 6 on deposit. The total numher of departures during 

 the same period, b}'^ death and removals, was 75. 



Amongst these special attention is called to the following : — 



1. Two Short-winged Tyrants (Machetornis rixosa), purchased 

 Feb. 15. These are the first examples of tMs bird that have 

 reached us. 



2. A female Beatrix Antelope {Oryx heatrix) from Arabia, 

 presented by Lt.-Col. Talbot, Feb. 18. The pair of this Antelope 

 presented by Col. Ross in 1890 being still alive, the receipt of 

 another female makes a very acceptable addition to our series. 



Mr. J. Graham Kerr gave a short account of the late Captain 

 John Page's expedition up the Eio Pilcomayo, which he had 

 accompanied as Naturalist upon the recommendation of the Council 

 of this Society. Leaving England in the summer of 1889, Mr. Kerr 

 spent some months studying the Zoology of the Pampas. In 

 January of 1890 he left Buenos Aires in the steamship 'Bolivia,' 

 which had been specially constructed for the expedition, and after 

 several weeks spent on the Parana, and a short preliminary trip up 

 the Bermejo River, entered the Pilcomayo in March of 1890. Rapid 

 progress was made for the first few days — the river being, although 

 intensely tortuous, comparatively broad and unobstructed. The 

 banks were here covered with thick and almost impenetrable forests, 

 chiefly of small scrubby trees, and characterized by a great paucity 

 of animal life. The most conspicuous mammals were : — the Caraya 

 Monkey {Mycetes caraya), troops of which were to be seen in the 

 trees by the river-side ; the Mirikina {Nyctipithecus trivirgatus), of 

 which some half a dozen specimens were killed ; the Tapir (Tapirus 

 americanus), the tracks of which were to be seen in all directions ; 



