Originally published February 1950
Revised February 1952
Reprinted May 1960
Revised July 1963; May 1964
Reprinted Jan. 1967
Reprinted Jan. 1969
Reprinted August 1970
_By_
JOHN E. WERLER
Director, Houston Zoological Gardens
[Illustration: Texas State Seal]
Published by Texas Parks and Wildlife Department
Austin, Texas