ACKNOWLEDGMENTS 3 



manian countrymen there is no difficulty. But the great majority of 

 smaller birds are not so recognized. With wide-ranging species 

 through the x^merican tropics, often appropriate names are available 

 from other Spanish-speaking countries. With some of obscure habit 

 it has been necessary to propose names in both languages. 



The line drawings that accompany the text, made by the competent 

 hand of Walter A. Weber, have been planned to illustrate type forms 

 in the various families. 



Usage in scientific names follows the International Code of Zoo- 

 logical Nomenclature, print of 1964, which includes amendments made 

 at the XVIth International Congress of Zoology, held at Washington 

 in 1963. 



ACKNOWLEDGMENTS 



In the preparation of the present volume, in addition to the exten- 

 sive collections now in the U. S. National Museum, record specimens 

 have been examined in the American Museum of Natural History, 

 the Museum of Comparative Zoology, the Field Museum of Natural 

 History, the Royal Ontario Museum of Zoology, and the British 

 Museum (Natural History). Other important material has been 

 received on loan from the Carnegie Museum. 



The close and friendly association that I have had throughout the 

 years of my work in the Republic with the Museo Nacional of Panama 

 and its Director, Dr. Alejandro Mendez Pereira, and with the staff 

 of the Gorgas Memorial Laboratory and its Director, Dr. Martin 

 Young, has been of continued value. More recently there has been 

 similar contact with Dr. Horace Loftin, head of the Florida State 

 University Center for Tropical Studies, with headquarters in the 

 Canal Zone. 



Government authorities of the Republic of Panama have continued 

 assistance in numerous ways. I have again to thank General de Bri- 

 gada Bolivar E. Vallarino, Comandante Jefe de la Guardia Na- 

 cional, for permits that allowed continuance of work in the field in the 

 seasons of 1965 and 1966. These two years have given especially 

 valuable data for the present volume. In 1966 officials of the Chiriqui 

 Land Company at Puerto Armuelles aided in providing living quarters 

 and in other ways during work in the area of the Burica Peninsula. 



Major assistance in the continued sharing of data of mutual interest 

 has come especially from Dr. Eugene Eisenmann in New York, and 

 from Dr. Pedro Galindo in Panama. Many pleasant memories remain 

 with me of my contacts with the friendly and courteous residents of 

 the Republic as I have traveled and lived in their country. 



