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Aeoloplus turnbullij (Thos. ) 
Ageniotettix deorum ( Scudd. ) 
Anlocara elliotti (Thos.) 
Camnula pellucida ( Scudd. ) 
Melanoplus bivittatus (Say) 
Mela.noplus dif ferentialis (Thos.) 
Melanoplus femur- rub rum (Deg. ) 
Melanoplus f oedus ( Scudd. ) 
Melanoplus mexicanus (Sauss.) 
Melanoplus packardii ( Scudd. ) 
The data were obtained from the collections and adult survey re- 
cords made during the last 6 years in seven States having ma,jor grass- 
hopper infestations. These data we re considered sufficient to show trends 
in six major crops and habitats selected as important in most of these 
Stoles. 
Where zeros are recorded in the tables no specimen of that species 
was collected in that habitat during that year, although it probably was 
present, but \7as either so scarce or so agile a,s to escape the collector’s 
net, None of the collections made in Colorado or Kansas have ever shown 
the true relative abundance of Dissosteira longipennis , because it is too 
agile to be captured by ordinary collecting and for that reason it has not 
been included in the tables. It is largely a range species, however, o.nd 
this report deals mainly with so-called crop grasshoppers. 
Where figures were available, the average total populations of all 
species are given for all environments because they show the general trends 
for all species collectively. Where advisable, a State was divided on the 
basis of wide differences in rainfall. 
The conclusions drawn from the tables for seven States are based on 
the surveys of the permanent representative areas made in 1940 and 1941. 
These areas were selected because of their past grasshopper history, and 
most of them are located in the areas of heaviest infestation. Therefore, 
the averages for 1940 and 1941 are probably exaggerated and not represent- 
ative of conditions in any State as a whole. 
Generally speaking, grasshopper infestations throughout the seven 
States are at present at a relatively low stage, especially those composed 
of the most important species, and particularly of Melanoplus mexicanus . 
The surveys of 1941 indicate that M. bivittatus , M. dif f erentialis , and 
M. f emur- rub rum have supplanted M. mexicanus in importance in many of the 
areas showing economic infestations. 
C0I0BAD0 
Only the foothill and plains area, east of the mountains was included 
in the study of Colorado. This is an area of diversified farming, either 
irrigated or nonirrigated, where the principal crops are winter wheat and 
other small grains, corn, sorghums, alfalfa, tame and wild hay, sugar beets, 
and truck crops. There is also included an abundance of pasture land used 
for the raising of beef cattle and sheep. 
In the irrigated sections Mela noplus bivittatus , M . different. ialis , 
M. f emur— rub rum, and M. mexicanus are the important species, with Aeoloplus 
turnbul 1 ii somet ime s numerous. In the dryland crops, M. mexicanus is the 
major species, with A, turnbull i i , M. packardii , and M. f oedus of greater 
