28 BULLETIN 117, UNITED STATES NATIONAL MUSEUM. 



The statement of Carlos Duqiie, quoted by Heller, shows that the 

 settlement of the Santa Ana Valley has been followed by the dis- 

 appearance of certain species hunted for their flesh, but it is not 

 probable that any very marked change in the fauna has occurred. 

 The rainfall is too small to have produced a forest and crops are grown 

 successfully only under irrigation. 



The 66 species recorded from the Santa Ana Valley probably^ 

 therefore, fairly represent the original fauna. Of this number, 38, 

 or more than half, are of general distribution throughout Tropical 

 America. Of the remaining 28, no less than 19 are of Brazilian 

 origin. Some of these birds, as Nothura viaculosa, Bucco chacuru, 

 and Euscarfhmus margaritaceiventer, extend southward to Paraguay 

 and are unknown north of the Amazon, while eight of them range 

 eastward and northward to Guiana. These are: Hoploxypterus 

 cayaniis, Ciccala huhula, Eu2)etomena macroura liirundo (subspecies 

 Peruvian), Elaenia cristafa, Suhlegatus fasciatus, Myiarchus pelzeini, 

 Alopoclielidon fucata, CorypJiospingus cucuUatus. None of these, it is- 

 interesting to note, has been recorded from Colombia. There are 

 also several species like Elaenia gigas, Sporopliila ohscura and Piranga 

 testacea which do not range far from the base of the Andes, but the 

 distinctive avifauna of the arid Tropical Zone of the Santa Ana 

 Valley has evidently been derived through western Brazil and it 

 contains both southern and northern elements. 



DISTRIBUTIONAL ANALYSIS OF ARID TROPICAL ZONE BIRDS. 



Crypturus purvirostris Southeastern and central Brazil. 



Nothura maculosa jJeruviana Southern Brazil to Uruguay; subspecies Peru. 



Columba rufina rufina Tropical South America. 



Zenaida auriculata pollens Southern South America; subspecies Pacific 



coast to Colombia. 



Chamaepelia minuta niinula Tropical South America. 



Leptotila ochroptera ochroptera Southern and eastern Brazil. 



Credscus vmdis facialis Tropical South America; subspecies Peru. 



Hoploxypto'us cayaniis Southern Brazil to Guiana. 



Helodromas soUtarius North American migrant. 



Phalacrocorax vigua vigua South America generally. 



Cathartes atrata South America generally. 



Catharista urubu South America generally. 



Parabuteo unicinctus unicinctus South America generally. 



Cerchneis sparveria, subspecies South America generally. 



Otus choliba South America generally. 



Ciccaha huhula Brazil to Guiana. 



Tyio perlata, subspecies South America generally. 



Ceryle avicricana Tropical America generally. 



Streptoprocne z. zonaris South America generally. 



Eupetomena macroura hirundo Brazil to Guiana; subspecies Peru; Bolivia. 



Chlorostilbon prasinus daphne Tropical South America; subspecies ^Peru ^^ta 



Colombia. 

 Piaya cay ana obscura Tropical America ; subspecies [Peru,rf,Bolivia, 



western Brazil. 



