GEOGRAPHIC DISTRIBUTION OF LIFE IN NORTH AMERICA. 377 
half in his ** North Mexico and Texas district,’ and the southern half 
in his tropical “ Mexican District.” Hartlaub and Newton, in 1886, 
placed the entire peninsula in their Mexican region, and Heilprin, in 
1887, in his Sonoran transition region. 
The way in which Lower California has been regarded by different 
writers is Shown in the following table :* 
Date. Author. | How regarded. Buy based Rank. 
TS87e| Martins \---.<.c-- - As part of his Mexican extra-tropical realm-.---- Plantsi=22-2 = 0 
1838 | Berghaus. --...-..-. As part of his Mexican realm (‘‘Jacquin’s realm”’)|....do..-...--. 0 
TR SHS bbe (ae a eee As part of his Californian region.....-.-.....-.-- Soe QO ey seers 0 
1845 Berghaus.-...----. As part of his tropical province ...-..-..-.-.----- Mammals..... 0 
1854 | Agassiz .......-..- As part of his Californian fauna....-...-...------ Animals ...--- 0 
1856 | Woodward ..-..-- As part of his Californian province. -.------------ Mollusks ..... 0 
IAL SI S16 oC Fee | Asa sub-division of his middle province ..---..--- Birds:223-c0- 2 
1859 | Le Conte ..-.-.... | As paxrk.of nis central district).------+---2------=- imsectse === 0 
1861 | Cooper .....--.-.- | As a sub-division of his Nevadian [=—Californian] | Forests.-....-. 2 
| province. 
1866 | Grisebach .....--. | As part of his Californian region........--------- Plants. .-<-- =: 0 
1870 | Brown....-------- As part of his Colorado desert district -----.--.--- HOLGStSseni-o== 0 
1872 | Grisebach ......-.| As part of his prairieregion.....-...-..-..-.--.-- Peblamust sense 0 
21 YG) LOLs) of a ee eee Asan independent region............------------| Reptiles and 2 
| batrachians. 
1876 | Wallace .....-.--- As part of his California sub-region. --..--..----- | Animals ...... 0 
1882.) Engler. .-.....-..-- A‘s.part of his Aztec province----..-.--.----..--- | Plants .....--. 0 
1883 | Packard .......-... | As part of his central province -......-----.----- | Animals -......| 0 
TEE I Digi Ce eee ees | As part of his Mexican district ........---.-.--.- [SE TaMpS levee meter 0 
1886 | JG hE Secs Bmeee OO osc aes esses Ss Pe ealie te hea stasse ose Birds). s--.--- | 0 
1887 | Heilprin.-.....--- As part of his Sonoran transition region ---..-...-- Animals --.-. -- 0 
1890 | Merriam.......... As a division of his Sonoran province.-.---...---- Animals and 2 
plants. 
southern extremity. 
SOUTHERN FLORIDA. 
The large number of tropical forms of life inhabiting southern Florida 
early led to its separation from the rest of the Atlantic region by writers 
on the distribution of animals and plants. Lesson (in 1851) placed it 
along with Mexico in his south temperate zone. Hinds (in 1843), 
recognizing its Antillean affinities, placed the southern extremity of 
the peninsula (south of latitude 27°) in his West India region. 
