472 PROCEEDINGS OF THE ACADEMY OF [June, 



Encoptolophus sordidus Melanoplus femoratus 



Dissosteira Carolina Conocephalus triops 



Melanoplus atlanis Orchelirnum vulgar e 



" femur-ruhrum Xiphidium fasciatum 

 " minor *' brevipenne 



" differentialis 



This list is doubtless incomplete. Further examination of the 

 country would probably show the presence of other typical or common 

 Piedmont forms not here listed. 



The river marshes are characterized by a fauna which in many 

 respects approximates that typical of the wet lands of the Coastal 

 Plain, but which retains a strong Piedmont cast. In southeastern 

 Pennsylvania these marshes have yielded a rich Orthopteran fauna 

 consisting of the following species: 



Dichromorpha viridis Paroxya floridiana 



Orphidella speciosa Scudderia texensis 



" pelidna " curvicauda 



Stenohothrus curtipennis Amblycorypha rotundifolia^^ 



Mecostethus lineatus Conocephalus robustus 



Arphia xanthoptera " triops 



Chortophaga viridifasciata " nebrascensis 



Encoptolophus sordidus « " palustris 



Dissosteira Carolina Orchelirnum vulgare 



Schistocerca aliitacea^^ " spinulosum 



Melanoplus atlanis Xiphidium fasciatum 



" femur-rubrum " saltans^'^ 



" minor " brevipenne 



" differentialis " strictum 

 " femoratus 



In this list two minor groups are represented, i.e., that charac- 

 teristic of dry ground, such as occurs on the low elevations which 

 occur here and there on the marshes, and that of the marshes proper. 

 The former includes such species as Orjjhulella speciosa, 0. pelidna, 

 Arphia xanthoptera, Chortophaga viridifasciata, Encoptolophus sordidus, 

 Dissosteira Carolina, Melanoplus atlanis, M. minor, Conocephalus 

 robustus, and Xiphidium strictum. The second group includes 

 Stenobothrus curtipennis, Mecostethus lineatus, Paroxya floridiana, 

 Conocephalus nebrascensis, C. palustris and Orchelirnum spimdosum. 

 The remaining species occur indifferently in both kinds of habitat, 

 though certain of them may exhil)it a stronger preference for one 

 of the habitats as compared with the other. 



" Apparently very unusual, but represented by specimens in the collection 

 of the Academy of Natural Sciences. 



