Sonoran Division. lo 



Dale Anilior Xainc given to regioti Baaed on Rank 



1873 Cope Au8tvoriparian Region. . Repts. and batrchs. 2 



1874 Porter Southern District Plants 2 



18S:] Jordan Southern Distrii't ]\Iohusks 4 



18S4 Sargent Coast Pine Region Forests 2 



1890 Merriani Austroriparian Region. . Animals and plants. 2 



Sonoran Division. " 



The term 'Sonoma Region^ has been applied by Cope and 

 others to an important life area which enters the southwestern 

 part of the United States from the table-land of ]Mexico. It was 

 first recognized by a botanist, Richard Brinsley Hinds, R. N., 

 surgeon to H. M. S. Sulphur., who published a description of it 

 in 1843 under the name 'The Chihuahua Region.'' He defined it 

 as extending south to the tropic, west to the Gulf of California 

 and the Colorado River, north to the prairie region of the United 

 States, and separated on the east from the Gulf of Mexico by a 

 northward extension of the Central American region along the 

 lowlands l^ordering the coast. Professor Baird (in 1866) stated 

 that along the valleys of the Rio Grande and Gila the fauna of 

 the Central Province " is greatly mixed up with the peculiar 

 fauna of northern Mexico, which, as far as its summer birds in- 

 dicate, is almost entitled to be considered as a fourth main 

 province." 



The extent to which this region has been recognized will appear 

 from the following talkie : 



Date Author Name given to region Based on Rank 



184.'] Hinds Chihuahuan Plants 1 



185;) Le Conte. . . . Southwestern and South- Insects 2 



south western Provinces. 



1859 Cooper Arizonian Region Forests 2 



18G1 Cooper Arizonian and Chihua- Forests 2 



huan Regions. 



1866 Baird [No name given] , Birds 2 



1870 Brown New Mexican Region. . . Forests 2 



1873 Cope Sonoran Repts. and batrchs. . 2 



1874 Porter Cactus Region Plants 1 



1878 Dyer Mexico-Californian Flora Plants 2 



1882 Engler Aztec Province Plants 3 



1884 Sargent Mexican Forest Region. . Foi-ests 1 



1884 Drude North Mexico and Texas Plants 2 



District. 

 1887 lleilprin Sonoran Transition Re- Animals (?) 



gion. 

 1890 Merriam Sonoran Province Animals and plants. 1 



