1913] Zoo-Geography 27 



parently extending their ranges nortli of l^euse River are coacli- 

 wliip snake, ground and diamond rattlesnakes, nonpareil, Flori- 

 da cormorant, coral snake, and some others, but our data with 

 regard to many of the species is so meager that we cannot draw 

 any definite conclusions from it. 



In part of the zone lying north of ]!^euse River there appears 

 to he a much greater admixture of Upper Austral forms than 

 further south ; in fact, south of that line we meet with only scat- 

 tering examples of species belonging to the more northern zone. 

 Thus the localities lying on or above Neuse River (excluding 

 Raleigh) give a total of 49 Lower Austral records, to 18 Upper 

 Austral, while those localities southward give only 5 Upper 

 Austral records to a total of 95 Lower Austral, thus showing a 

 much greater intermingling as we go northward which is just 

 what we ought to expect, as no life area is ever homogenous, 

 but gradually blends on the borders with the adjoining ones 

 or areas, consequently the boundaries we draw between 

 any two contiguous zones are largely arbitrary, and if we drew 

 maps to record things exactly as they are we would cause the 

 colors of adjoining zones to gradually blend the one into the 

 other just as their fauna actually blends. 



Raleigh, N. C. 



