Birds of Uruguay. 175 



be quite rare. In the valley of the Rio Negro it is fairly 

 common. The name Urraca Avas probably bestowed from 

 its sounding like one of the bird's notes. 



35. Myiotheretes RurivENTRis. Chocolate Tyrant. 



An autumn visitor for the winter. I saw one as early as 

 the 19th February, but it was not until the 5th March that 

 they appeared in any great numbers ; after that date they were 

 not uncommon in parties of a dozen or less. They bear a 

 superficial resemblance to Fieldfares^ haunting the opeu camp, 

 especially ground sloping down to a caiiada. They hop more 

 than they run, and like to sit on a small ant-hill or other 

 slight elevation, moving their rather long tails up and down; 

 occasioually they will perch on the posts of the wire fences. 

 The flight is swift and glancing on long poiuted wings, the 

 light brown on the secondaries being exposed in flight. 



36. T/ENioPTERA NENGETA. Pcpoaza Tyrant. (Plate V. 

 figs. 3, 4, eggs.) 



Irides reddish 'orange or orange-red. Bill and legs black. 



This beautiful Tyrant was not uncommon, but with oue 

 exception I never remember seeing it anywhere except about 

 an estancia or some other house where there were trees. 

 The one exception was on 3rd December, when I saw a pair 

 with young just out of the nest in some rather open monte 

 by the Arroyo Grande, but even then the estancia of Sta. 

 Adelaida was not more than half a mile away. We had 

 three or four pairs breeding at Sta, Elena, and I noticed 

 more than one pair at Sta. Ana and others at various places. 

 On the journey down from the Rio Negro I observed it at a 

 fonda just south of the Paso de Navarro, also at an estancia 

 where we stayed a night, between there and Porongos, and 

 at other places, but I did not see it on the north bank of the 

 Rio Negro. On the 8th November I examined two nests in 

 the quinta. Oue was built in the crown of a young Piiius 

 insignis, about 10 feet from the ground, and was formed of 

 line twigs and roots, and lined with horse-hair. It contained 

 oue egg (beside three Toldo^s), of an elongated ovate shape, 

 warmly tinted white, marked at the larger end with a few 



