110 PROCEEDINGS OF THE ACADEMY OF [April, 



Transi- Upper Lower 



Boreal. tion. Austral. Austral. Sabalian. 



Oecanthus pini 1 



Oecanthus latipennis 1 1 



Neoxabea bipundata 1 1 



Anaxipha exigua 1 1 



Anaxipha pulicaria 1 



Anaxipha vittata 



Falcicula hebardi 1 1 



Cyrtoxipha columbiana 1 1 



Phylloscyrtus pulchellus 1 1 



Hapithus a. agitator 1 (part) 1 (part) 



Hapithus a. quadratus 1 (part) 



Hapithus brevipennis 



Orocharis saltator 1 1 



(part) 



Physiographic and Zonal Factors Compared. 



When the physiographic and zonal correlations are contrasted, 

 we find that in Virginia the two factors are largely governed by the 

 same boundaries, the Lower Austral alone not extending up the 

 valley of the Potomac as far as the fall-line, which is the Piedmont- 

 Upper Coastal Plain line. In North Carolina, the increased tem- 

 perature effect of lower latitudes is evident, as the upper line of the 

 Lower Austral, after following the fall-line, crosses it and ascends 

 to higher country, this tendency increasing in Georgia, where the 

 upper boundary of the same zone is in places as high as a thousand 

 feet above sea level. Conversely, this crossing of the physiographic 

 boundaries by zonal boundaries is found to the northward of the 

 area here treated, where the entire Coastal Plain section of New 

 Jersey and all or at least the greater portion of the Coastal Plain 

 eastern peninsula of Virginia, Maryland and Delaware, is Upper 

 Austral. It has been found in the Middle Atlantic States that many 

 Upper Austral species are limited to southern New Jersey, not 

 occurring above the fall-line. This restriction is probably due to 

 the fact that the southern portion of New Jersey has a more equable 

 winter climate (and consequently a higher sum total annual tem- 

 perature) than the Piedmont of Pennsylvania, an Upper Austral 

 region. There is also in southern New Jersey an extension of certain 

 elsewhere Lower Austral species, although in the great majority of 

 the forms the region is clearly Carolinian. The control governing 

 the distribution of these species is probably environment, as the 

 sands and gravels of southern New Jersey are in general similar to 

 those of the Coastal Plain to the south. 



Origin of the Orthopterous Fauna of the Southeastern States. 

 We have made some tabulations bearing on the probable origin 



