INTRODUCTION. Bs 
Gardner, from California; Dr. F. N. Duncan, from Illinois; Dr. C. W. 
Metz, from Cuba, Isle of Pines, Jamaica, Louisiana, Florida, Cali- 
fornia, and Long Island. 
Dr. C. W. Metz has not only furnished many specimens from inter- 
esting localities, but he has furnished a large amount of very valuable 
data concerning the habits of many rare species. He and the writer 
collected together in Cuba, and the material recorded here from 
Havana, Santiago de las Vegas, Guareiras, and Aguada Pasajeros, 
unless credited to some other collector, is the result of our joint efforts. 
Dr. Metz and I have worked together for several years in attempts to 
breed various species in the laboratory, and a very large part of the 
success that we have had is due to his interest, energy, and ingenuity. 
From no one else have I received so much help in the collection of the 
material for this paper, either in the matter of actual data or in that 
of interest in and encouragement of the work. 
During the early part of 1915 I collected in the American tropics, 
and the success of that trip was in large part due to the facilities given 
me by Professor Carlos de la Torre at Havana, by Dr. 8. T. Darling 
at Ancon, Canal Zone, and by Dr. A. Alfaro and Professor J. F. Tristan 
at San Jose, Costa Rica. This trip was made possible by an appoint- 
ment to a Cutting Fellowship by Columbia University. 
