-3°°- 
Each of the four States was subdivided into districts. This sub- 
division was based on a general knowledge of the difference in topography, 
crops, climatic conditions, plant associations, ana differences in the normal 
distribution of dominant species" of grasshoppers. 
North Dakota 
District 1. Eastern. Counties east of the 99th meridian. Prairie or tall- 
grass region. 
District 2. Northern and western. Counties north of 48 latitude end west 
of 99° longitude. Plains or short-grass region. 
1 1 
District 3.1 Southern and western. Counties south of 48 latitude and west of 
99° longitude. Plains or short-grass region. 
South Dakota 
District 1. Northeastern. Counties east of 99° longitude, and north of 
44»2° latitude. Prairie. or tall-grass region. 
District 2.- Southeastern. Counties east of 99° longitude, and south of 
44«2° latitude.. Prairie or tall-grass region. 
District 3. Central. Counties between 99° longitude and 102° longitude. 
Short-trass region* 
District 4« 'western. Counties west of 102° longitude. Short-grass and 
yellow pine .region, also Black Hills area. 
Wyoming 
District 1. Eastern. Counties east of the Big Horn Mountains and 107° longi- 
tude in the northeast, and east of the Laramie Mountains and 106° longitude 
in the southeast. Short-grass region* 
District 2. Western. Counties west of district 1. Sagebrush region. 
Montana 
District 1. Western and mountain. Counties immediately east of the Conti- 
nental Divide to the ll8th meridian in the north, then south to the Missouri 
River, east to IO8.5 longitude, and south to the border. Short-grass and 
lodgepole pine area. 
District 2. Northern and eastern. Counties north of the Missouri River from 
the 112th meridian east, ,' Short-grass region. 
District 3.' Eastern. Counties south'of the Missouri 3iver and'east of IO8.5 
longitude. 
