IOWA ACADEMY OF SCIENCES. 35 



A REVIEW OF THE TETTIGONIDA^ OF NORTH 

 AMERICA NORTH OF MEXICO. 



BY E. 1). BALL. 



The present paper has been planned to serve a double 

 purpose. Its first object being to furnish a means of sep- 

 arating and determining the members of this family found 

 in the United States and Canada, together with their vari- 

 eties and the synonomy as far as it has been worked out. 

 Secondly, to give sufficiently accurate and detailed descrip- 

 tions in all cases, even where not necessary in the separa- 

 tion of our own forms, so that later workers in the group 

 and those from other parts will be able to discriminate 

 between our species and closely allied forms from other 

 regions, or to recognize our forms when found in other 

 countries. 



This is all the more necessary from the fact that this 

 group, which forms a very small part of the Jassid fauna 

 in the United States, becomes the dominant one in tropi- 

 cal regions, especially of the Western Continent. Of the 

 five hundred or more described species the great majority 

 are found in the region between Mexico and Brazil. A 

 number of these species, among which are some of our 

 own forms, extend throughout the whole of this territory. 



Taking into account these facts and the addditional one 

 that most of the work on the group so far has been done 

 by European authors, whose material was mainly from 

 tropical regions, and who paid little attention to the 

 isolated descriptions of the American authors, it is little 

 wonder that there is much of synonomy. At the same time 

 American authors have paid little attention to the Euro- 

 pean work, and a goodly number of the later synonyms are 

 from this side of the water. Mr. Walker, of course, con- 



