Howell — Notes on the Distribution of Certain Mammals. 57 



berland Range in Tennessee and supports a small area of Transi- 

 tion Zone above 3,000 feet. The same zone appears also at con- 

 siderably lower altitudes in this range in shaded ravines having a 

 northern exposure, as at High Cliff, along the north base of the 

 Cumberland Escarpment, where Transition descends to about 

 1,000 feet altitude. Walden Ridge is a fairly level plateau vary- 

 ing in altitude from 1,600 to 2,400 feet, and extends from the 

 vicinity of Chattanooga northeastward to Anderson County. It 

 is included in the Upper Austral Zone, though a very few Transi- 

 tion species occur in small isolated areas in the cool gulches cut 

 by the streams. 



Northern Alabama was next examined, and collections were 

 made at Scottsboro (September 1-3) and Huntsville (Septem- 

 ber 4-10). Lower Austral Zone extends up the Tennessee Valley 

 in this State as far at least as Scottsboro, A short detour was 

 made into West Tennessee to trace out the boundaries of this 

 zone, which reaches east to western Lawrence County. Collec- 

 tions were made at Lawrenceburg (September 12-15) within 

 the Upper Austral Zone. 



In northern Mississippi short stops were made at Burnsville 

 (September 16-18), Michigan City (September 22, 23), and 

 Holly Springs (September 21). Practically the whole of Missis- 

 sippi is included in the Lower Austral Zone, as shown by the 

 presence in the northernmost counties of swamp rabbits, and 

 of such characteristic trees as Quercus nigra, Q. lyrata, Nyssa 

 aquatica, and Taxodium distichum. 



In central and southern Alabama collections were made at 

 the following localities; Reform, Pickens County (September 

 24-27; Talladega (September 28, 29); Auburn (October 1-5); 

 Brewton (October 7, 8); Castleberry (October i)-13); Fairhope 

 October 16, 17); and Bon Secour (October 18-26). At the last 

 mentioned place opportunity was afforded to visit the Gulf 

 beach and study the peculiar fauna of that region. 



A few days were spent in southeastern Louisiana, at Slidell 

 (October 28-31) and Covington (November 2, 3), after which my 

 work was confined to certain special investigations, first in the 

 section of Mississippi occupied by the cotton boll weevil, and later 

 in central Georgia, tracing out the ranges of the two swamp rab- 

 bits (Lcpm aquaticus and L. jxdustris). The localities visited in 

 Georgia were Abbeville (November 18), DeSoto (November 19), 



