UNITED STATES 



EXPLORING EXPEDITION. 



. 



DURING THE YEARS 



1888, 1839, 1840, 1841, 1842. 



UNDER THE COMMAND OF 



CHARLES WILKES, U. S. N. 

 YOL. XX. 



HERPETOLOGY, 



BT 



CHARLES GIRARD, 



DOCTOR is MEDICINE: AND SURGERY: CORRESPONDING MEMBER OF THE BOSTON 



SOCIETY OF NATURAL HISTORY; THE ACADEMY OF NATURAL SCIENCES OF PHILADELPHIA; 

 THE LYCEUM OF NATURAL HISTORY OF NEW YORK; THE ELLIOT SOCIETY OF 



NATURAL HISTORY OF CHARLESTON, s. c.: THE CALIFORNIA ACADEMY 



OF NATURAL SCIENCES, SAN FRANCISCO: THE "SOCIETE HELVETIQUE 



DES SCIENCES NATURELLES :" THE " SATURFOUSC HENDE GESELL- 



SCHAFT IN ZURICH;" AND THE "SOCIETE DES SCIENCES 



NATURELLES DE XEUCHATEL (SWITZERLAND)," ETC. 



WITH A FOLIO ATLAS. 



PHILADELPHIA: 



J. B. L I P P I X C T T & CO. 



1858. 



UIIVBRSITY 



