vi INTRODUCTION, 
information communicated to me; and I must especially thank Count 
Salvadori and Dr. Otto Finsch for their generous contributions, while 
Prof, Allen, Prof. Ridgway, Mr. Richmond, and Mr. Oberholser have 
most carefully read through the proofs, and their suggestions have been 
of great service. All my colleagues in America have throughout the 
progress of the ‘ Hand-list’’ rendered me most important assistance, while 
Dr. Sclater and Mr. Hartert have done the same for me in this country. 
To the following gentlemen I have been indebted for special help in the 
preparation of the present volume :— 
England.—Dr. P. L. Sclater, Mr. Howard Saunders, Hon. Walter 
Rothschild, Mr. Ernst Hartert, Mr. W. R. Ogilvie Grant, 
Mr. C. W. Andrews, and Mr. W. P. Pycraft. In the prepara- 
tion of the Index and in many other respects, I have received 
great assistance from my indefatigable chief attendant, 
Mr. Charles Chubb. 
France.—Professor E. Oustalet. 
Holland.—Dr. Otto Finsch. 
Germany.—Professor A. Reichenow, Dr. A. B. Meyer, Count 
von Berlepsch. 
Russia.—Dr. Bianchi. 
Ltaly.—Count Salvadori. 
America,—Professor Robert Ridgway, Dr. L. Stejneger, Professor 
J. A. Allen, Mr. Frank M. Chapman, Mr. C. W. Richmond, 
Mr. Witmer Stone, Mr. Harry Oberholser, and Mr. Outram 
Bangs. 
R. BOWDLER SHARPE. 
July 5, 1901. 
