W. L. TOWER 



PLATE 8 







MAP OF EASTERN UNITED STATES AND LOWER CANADA SHOWING YEARLY LINES OF ADVANCES OF 

 L. DECEMLINEATA DURING ITS EASTWARD MIGRATION, 1859-1904 



Important records are indicated by red dots, advance introductions by a uniform neutr; 

 The prevailing direction ot the wind during summer is shown by a blue arrow 



