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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.
UPPER AUSTRAL ZONE
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.
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 southward
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, stiffstemmed
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.
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