UNITED STATES 



EXPLORING EXPEDITION. 



DURING THE YEARS 



V 



1838, 1839, 1840, 1841, 1842. 



UNDEE THE COMMAND OE 



CHARLES WILKES, U. S. N. 



ATLAS. 



HERPETOLOGY. 



PREPARED UNDER THE SUPERINTENDENCE OP 



S. F. BAIRD. 



BY AUTHORITY OF CONGRESS. 



PHILADELPHIA: 



C. SHERMAN & SON, PRINTERS. 



1 8 5 8. 



