Examination of specimens was made possible by the provision of working
space at various institutions or through the loan of specimens. For
their generosity in this manner we are grateful to Richard J. Baldauf,
Charles M. Bogert, James E. Boehlke, Doris M. Cochran, Robert F. Inger,
John M. Legler, Alan E. Leviton, Gerald Raun, Jay M. Savage, Hobart M.
Smith, Robert C. Stebbins, Wilmer W. Tanner, Charles F. Walker, Ernest
E. Williams, and Richard G. Zweifel.
Duellman is especially grateful to Charles W. Myers, Linda Trueb,
Jerome B. Tulecke, and John Wellman for their assistance in the field
and to Linda Trueb for her work on the cranial osteology that is
incorporated in this report. Fouquette is indebted to H. Morgan Smith
and A. C. Collins for assistance in the field, to A. J. Delahoussaye
for assistance in the laboratory, and to W. Frank Blair for use of the
facilities of the sound laboratory at the University of Texas and for
much help in the early stages of this study.
The research reported herein was accomplished mainly through support
by the National Science Foundation (grants NSF G-9827 and GB-1441 to
Duellman and GB-599 to Fouquette). The latter's field work in Mexico
was assisted in part by NSF Grant G-4956 to W. Frank Blair. Some of
the field studies carried out in Panama by Duellman were supported by
a grant from the National Institutes of Health (NIH GM-12020).
We are grateful to many persons, too numerous to mention, who in
various ways aided our field work in Middle America. We are especially
indebted to Dr. Rodolfo Hernandez Corzo and the late Ing. Luis Macias
Arellano of the Direccion General de la Fauna Silvestre of the Mexican
government for providing permits to collect in Mexico.