94 PROCEEDINGS OF THE ACADEMY OF [April, 



more broadly influencing factor of the physiography of the land. 

 The physiographic divisions we here use are those which are cor- 

 related with the distribution of groups of species of the orders studied. 



Physiographic Regions. 

 The physiographic regions we find correlated with the distribution 

 of the species found in Virginia, North Carolina, South Carolina, 

 Georgia and northern Florida are: 



a. High Appalachian summits. 



b. Lower summits of the Appalachian uplift and higher valleys of 



the same area. 



c. Piedmont. 



d. Coastal Plain. This is divisible into two sections which we have 



for convenience called the Upper Coastal and the Lower 

 Coastal. 



e. Maritime and estuarine region. 



These regions may be roughly delimited as follows: 



High Appalachian Summits. — Only the highest peaks of the North 

 Carolina and Virginia mountains are embraced in this term. Very 

 few Orthoptera have been taken in this region. 



Lower Summits and Valleys of the Appalachian Uplift. — Comprising 

 the greater (remaining) portion of the Southern Appalachian system 

 to its disappearance in Alabama, and the typical mountain valleys, 

 as opposed to the broad intrusive Piedmont valleys, are grouped 

 under this heading. The Georgia mountains, having in general a 

 lower elevation than the major portion of the North Carolina moun- 

 tain area, lack a number of the species found in the latter region, 

 and also on their lower portions shelter species more typical of the 

 Piedmont. Other species, which also occur in the Georgia mountains, 

 penetrate the valleys of the North Carolina mountains, but do not 

 frequent the main ridges in the latter State. 



Piedmont. — This division includes the area of the Piedmont pene- 

 plain, or the region from the base of the Appalachians down to the 

 fall-line, also embracing some of the larger and broader valleys 

 which penetrate into the mountainous region proper. The fall-line 

 extends in a curve from the vicinity of Washington, District of 

 Columbia, to Columbus, Georgia. 



Coastal Plain. — All the area situated below (i.e., coast ward of) 

 the fall-line is embraced in this grouping. It is, from the Orthopteran 

 evidence, distinctly divisible into two portions which may for con- 

 venience be called the Upper and Lower Coastal Plain regions. 

 The Upper region covers all the territory of the Coastal Plain situated 



