BIRDS OF ARGENTINA, PAEAGUAY, URUGUAY, AND CHILE 17 



Rhea americana albescens. 

 Calopezus elegans morenoi. 

 'Nothura maculosa nigroguttata. 

 Nothnra darwini mendosensis. 

 Nothoprocta perdicaria perdicaria. 

 Rhynchotiis rufescens pallescens. 

 Spiziapteri/x circumcinctus. 

 Larus eirrocephalus. 

 Sterna trudeaui. 



Lcptotila ochroptera chlorauchenia. 

 Picazuros picazuros reichenbachi. 

 Notioenas maculosa fallax. 

 Amoropsitta ay mora. 

 Myiopsitta monachus monachus. 

 Dyctiopicus mixtus malleator. 

 Chrysoptilus melanolaimus perplexus. 

 Lepidocolaptes angusUrostris angusti- 



rostris. 

 Lepidocolaptes angustirostris pracda- 



tus. 



Drymornis b7-idgesii. 



Fnrnarius rufns rufus. 



Leptasthenura fuliginiceps paraensis. 



Siptornis patagonica. 



Stigmatura budytoides fiavocinerea. 



Rhinocrypta lanceolata. 



Teledromas fuscus. 



Spizitornis parulus curatus. 



Spizitornis parulus patagonicus. 



Troglodytes musculus bonariae. 



Mimus triurus. 



Mimus patagonicus tricosus. 



Trupialis defilippM. 



Phrygilus carbonarius. 



Diuca minor. 



Brachyspiza capensis argentina. 



Brachyspiza capensis choraules. 



Embernagra olivascens gossei. 



UPPER AUSTRAL ZONE 



Beyond the valley of the Rio Negro in Patagonia climatic condi- 

 tions become more austere and snow and ice are regular features of 

 a prolonged winter. This zone, which may be called the Upper 

 Austral, since it corresponds to that zone in the north, runs south- 

 ward apparently into Santa Cruz, perhaps almost to the Straits of 

 Magellan and extends to the base of the Andes in the west. It was 

 found at Zapala, Neuquen, though a narrow tongue of Lower Austral 

 came along the floor of a deep valley almost to Zapala, and from 

 there runs northward along the arid mountain slopes, being found 

 above 1,500 meters in Mendoza. It corresponds to Zone 2 in Peters' 

 statement of the life zones of Patagonia. Its occurrence in Chile 

 is uncertain, but it should be found along the northern border of the 

 southern forest region. In the south this zone is wholly arid and 

 covers an area of rolling plateaus, broken by rocky hills ai^id rough 

 valleys, covered with low, thorny bushes or mats of spiny, stiff- 

 stemmed plants that persist throughout the year. Various flowering 

 annuals appear with a somewhat rigorous spring and persist for 

 a short period. There are numerous lakes, particularly in the west 

 (many of them alkaline), with occasional patches of permanent green 

 vegetation in spring}^ localities. The region is one of high winds, 

 that blowing from the west, sweep with them air currents cold 

 from Andean snows. 



The following birds are characteristic of this area : 

 Pterocnemia pennata. Enicomis phoenicurus. 



Tinamotis ingoufi. Muscisaxicola capistrata. 



Calopezus elegans elegans. Muscisaxicola, maculirostris. 



Thinocorus orbignyianus. Sicalis lebruni. 



MetriopeUa m. melanoptera. Phrygilus aldunatei. 



Gcositta rufipennis. 



