368 Annals of the Carnegie Museum. 



in the preparation of this paper on the birds of Costa Rica. My 

 thanks are due to Mr. Ridgway and Dr. Richmond of the U. S. Na- 

 tional Museum for the privilege of examining specimens of Costa 

 Rican birds in that collection, and for help in determining species and 

 difficult points in nomenclature. I wish to thank Mr. Stone and Mr. 

 Rehn of the Academy of Natural Sciences of Philadelphia, and Dr. 

 Allen and Mr. W. D. Miller of the American Museum in New York, for 

 assistance in looking over specimens in those museums. I thank Mr. 

 Ogilvie-Grant, Curator of Birds in the British Museum, for information 

 furnished me concerning skins in that collection, and M. Eugene 

 Simon, of Paris, for assistance in settling the status of several species 

 of rare and little known humming-birds. My thanks are also 

 due to Senor don Jose Zeledon, Mr. C. H. Lankester, and Mr. C. F. 

 Underwood, of Costa Rica, for much valuable information concerning 

 the geographical distribution of species and information enabling me 

 to locate with certainty many names of localities used by the various 

 Costa Rican collectors, including themselves. To Mr. J. H. Flem- 

 ing of Toronto, Ontario, I am indebted for a list of the Costa Rican 

 specimens in his collection. 



Mr. W. E. C. Todd, Custodian of Birds and Mammals in the Car- 

 negie Museum, has also given me much assistance, dating from the 

 time I began my second trip to Costa Rica in 1903 and continued 

 during the year spent as his Assistant in the Carnegie Museum. 



My thanks are especially due to Mr. Outram Bangs of Boston, 

 Mass., who has aided me in every possible way in the preparation of 

 this manuscript, allowing me the great privilege of the use of his 

 library and entire collection of birds, helping me in the solution of 

 vexing problems, and giving helpful criticism as the work progressed. 



Lastly, I wish to express my thanks to Dr. W. J. Holland, Director 

 of the Carnegie Museum, through whose efforts all the material 

 accumulated during the five years of my stay in Costa Rica was 

 brought together at the Carnegie Museum, and through whose 

 encouragement and financial assistance I have been enabled to com- 

 plete the manuscript of this paper. Dr. Holland on the eve of my 

 departure for South America has also agreed to undertake the laborious 

 task of revising the manuscript and of reading the proof as the pages 

 come from the press. 



