1914. j NATURAL SCIENCES OF PHILADELPHIA. 485 



34. The Peat Bog association is a hygrophilous group associated 

 with a peaty substratum, abundant moisture, forested surroundings 

 and a prevailingly xerophytic type of vegetation. 



35. The claim of the Middle District to recognition as a distinct 

 Orthopteran faunistic subdivision of the Coastal Plain rests solely 

 upon the intermingling and overlapping of faunules from the adjoin- 

 ing centres of dispersal. Certain characteristic Piedmont species 

 are entirely or almost entirely limited to this part of the Coastal Plain. 



36. The Middle District includes a narrow strip of relatively low 

 land adjoining the Delaware River in southeastern Pennsylvania. 

 Faunistically, this shows considerable differences from the typical 

 Middle District as represented in west Jersey. 



37. The Orthopteran faunule of the Pennsylvania subdivision of 

 the Middle District is essentially a Piedmont fauna with which is 

 intermixed a minor constituent of Coastal Plain origin. The latter 

 is best represented in the river marshes. 



38. In the Middle District of west Jersey the dominant faunule 

 is the Coastal faunule, the Piedmont faunule being a decidedly minor 

 constituent of the Orthopteran fauna. The Pine Barren faunule 

 is only locally represented. 



39. The Piedmont types are frequent in the northern half of the 

 Middle District, but disappear rapidly in the southern section. 

 They are typically associated with the presence of loam soils, a 

 moderate supply of moisture and mesophytic vegetation. 



40. The Cape May District includes representatives of two 

 faunules. One, corresponding to the Coastal faunule, characterizes 

 the two sides of the Peninsula and its entire lower third; the other, 

 representing a southward extension of part of the Pine Barren 

 faunule, occupies the interior districts of the northern section. 



42. The Interior Orthopteran association of the Cape May Dis- 

 trict is a typical sylvan group. Clearing of the country and its 

 conversion into farm lands is accompanied by a disappearance of 

 the sylvan types and an invasion of the campestral Subcoastal 

 association. 



Annotated List of Species.'^ 



TRYXALIS Fabr. 

 T. brevicornis Johann. 



General Range. — Southern Ontario and Long Island to southern 



" In view of the more or less unsettled state of taxonomio nomenclature at 

 the present time, 1 have chosen to designate the speaies by the name^ which have 

 been in current use during the last decade rather than those which belong to 

 them according to the rule of priority. 



