XIV PREFACE 



ing visitors, invest these wonderful regions. It will, I hope, 

 supplement and add to the value of museum zoological work, 

 just as this tropical field research must, in tin-n, rest upon a 

 firm foundation of laboratory investigation. I desire that 

 this volume be considered as the joint contribution of Inness 

 Hartley, Pavd Howes and myself. 



In detail, Mr. Hartley's researches have been concerned 

 chiefly with the gathering of ornithological data and with 

 problems of embryology, while Mr. Howes has confined his 

 M^ork to entomology. The photographic illustrations are 

 from negatives taken by Mr. Howes and myself. For the 

 pastel of two trumpeter chicks I am indebted to Miss Persis 

 Kirmse. 



William Beebe. 



Kalacoon House, 



Hills Kstate, 



Mazaruni River, 



British Guiana. 



August 10, 1916. 



