NORXn AMERICAN BATKACHIA AND REPTILIA. 69 



FAUNAL REGIONS OF UNITED STATES. 



Austrorijparian Region. — Bordered on the south and east by 

 the Gulf of Mexico and the Atlantic; on the north and 

 west by a line extending south through the eastern part of 

 North and South Carolina, west through upper Georgia and 

 Alabama, north through the western part of Tennesssee and 

 Kentucky to Southern Illinois, west and south to Indian 

 Territory, and across the western corner of Texas to New 

 Mexico and the Rio Grande. It includes three districts: the 

 Floridan — the southern portion of Florida; the Louisian- 

 ian — from the Floridan to Texas; the Texan — Texas. 



Eastern Region — Bordered on the south by the Austroriparian ; 

 on the east by the Atlantic; on the west by a line running 

 north from the northeast corner of Indian Territory to 

 the southeast corner of Dakota, theuce northwest. 



Pacific Region — Bordered on the east by the Sierra Nevada 

 mountains; on the west by the Pacific; on the south by 

 Lower California. 



Lower Californian Region — Occupies the peninsula of that name. 



Central Region — Bordered on the east and north by the East- 

 ern; on the west by the Pacific; on the south by the Aus- 

 troriparian and Sonoraa regions. 



Sonoran Region — Includes parts of Nevada, New Mexico, Ari- 

 zona, and Sonora in Mexico. 



