1895.] NATURAL SCIENCES OF PHILADELPHIA. 381 



among the White Mountains, neither are its plants and animals 

 subjected to those frigid winter temperatures which their New Eng- 

 land congeners must suffer. In consequence there is a correlation in 

 the animal and plant life of these distant localities without identity. 

 In some cases this variation amounts to specific values, in others only 

 subspecific, but in all, owing to their isolation, the habitat is clearly 

 definable. 



Tennessee comprises within its limits an unusually varied topog- 

 raphy, and owing to its proximity in the west to the influence of the 

 Gulf of Mexico by way of the Mississippi, and in the east to the lofty 

 mountain ranges, the State presents a fauna and flora of great diver- 

 sity and unusual interest to the biologist. The greater pait of what 

 is popularly known as West Tennessee is in the Louisianian* fauna, 

 including all the country lying west of a line running north from 

 Lawrenceburg, Lawrence County, to the intersection of the Ken- 

 tucky state line by the Tennessee River. Animals characteristic of 

 this fauna, which rarely, if ever, are found in Middle Tennessee are 

 the two Marsh Hares, Lepus aquations and L. palustris ; a Cotton 

 Rat? Sigmodon ; a small Mole Shrew, Blarina; a large Deer Mouse, 

 Peromyseus; the Swallow-tailed Kite, Eleanoides forficatus ; Missis- 

 sippi Kite, Ictinia mississippiensis ; Snake Bird, Anhinga anhinga ; 

 Prothonotary Warbler, Protonotaria citrea ; Louisiana Tree-frog, 

 Hyla cinerea semifasciata ; Say's Chain Snake, Ophibolus getulus 

 sayi ; Louisiana Triton, Diemyctylus viridescens m&ridionalis ; 

 Cyclops Water Snake, Natrix eyclopion and the Alligator Snapper, 

 Macroclemys lacertina. 



From the western boundary of the Louisianian fauna, as above 

 defined, the whole of Middle and East Tennessee, below an altitude 

 of 3,0U0 feet, is included in the Carolinian fauna. Characteristic 

 animals of this fauna in Tennessee are the Opossum, Didelphys mar- 

 supialis ; Pine Mouse, Microtus pinetorum ; Least Mole Shrew, 



Blarina ? and typical forms of the eastern Deer Mouse, Gray 



Squirrel, Wood Rabbit, and the Gray Fox; also the Acadian 

 Flycatcher, Empidonax acadicus ; Yellow- breasted Chat, Icteria 

 wrens; Kentucky Warbler, Geothlypis formosa ; Blue-winged War- 

 bler, Helminthophila pinus, and Bewick's Wren, Thryothorus 



*Zoogeographic nomenclature used is that of Dr. J. A. Allen. Bull. Amer. 

 Mus. N. Hist., IV, Art. XIV, 1892. 



