Numbers of the BULLETIN OF THE FLORIDA STATE MUSEUM, BIOLOGICAL SCI- ENCES, are published at irregular intervals. Volumes contain about 300 pages and are not necessarily completed in any one calendar year. OLIVER L. AUSTIN, JR., Editor S. DAVID WEBB, Associate Editor RHODA J. BRYANT, Managing Editor Consultants for this issue: FRANCES C. JAMES WAYNE R. MARION Communications concerning purchase or exchange of the publications and all manuscripts should be addressed to: Managing Editor, Bulletin; Florida State Museum; University of Florida; Gainesville FL 32611; U.S.A. This public document was promulgated at an annual cost of $3480.00 or $3.48 per copy. It makes available to libraries, scholars, and all interested persons the results of researches in the natural sciences, emphasizing the circum-Caribbean region. Publication date: 12 May 1987 Price: $3.50