IOWA ACADEMY OF SCIENCES. 
35 
A REVIEW OF THE TETTIGONIDAiE OF NORTH 
AMERICA NORTH OF MEXICO. 
BY K. D. 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- 
