INSECT PEST SURVEY BULLETIN 
No. 14 Supplement No. 9 
THE SPECIES .aND DISTRIBUTION' OF GRASSHOPPERS RESPONSIBLE 
FOR THE I934 OUTBREAK 
R» L. Shotwell, Assistant Entomologist , 
Division of Qereal and Forage Insect Investigations , 
Bureau of Entomology and Plant Quarantine, 
United States Department of Agr i culture . j./ 
In connection with the grasshopper control campaign of 1934»" an adult 
grasshopper survey was made in the more heavily infested States during the 
latter part of. July and the month of August to determine the results of the 
poisoning operations and to locate areas where grasshoppers were still abundant 
and where eggs might be found during the fall egg survey. Considerable data 
were also obtained regarding the species responsible- for the outbreak and their 
relative abundance in some of the more common grasshopper habitats. 
DOMINANT SPECIES IN MONTANA, NORTH DAKOTA, SOUTH DAKOTA, AND WYOMING 
In Montana, North Dakota, South Dakota, and Wyoming, specimens were col- 
lected in typical environment by State leaders and tlheir assistants. From 
5 to 20 collections, representative of the grasshopper population of a certain 
habitat, were made in each county. The specimens were killed. in radiator 
alcohol and dried and preserved between sheets of paper toweling. A record was 
kept of the location and kind of environment. These -specimens were later 
identified and counted to determine the percentage of each species in the total 
number collected in each habitat. The collections from these > four States in- 
cluded 44»7 00 specimens. The data were then grouped according to the geograph- 
ical distribution and habitat. 
•i/The writer is indebted to the following State leaders who cooperated 
in making the survey of abundance of adult grasshoppers or in furnishing infor- 
mation regarding dominant species in their States:" E. D. Ball, Arizona; 
Stewart Lockwood, California; S. C. lie Campbell, Colorado; Claude wakeland, 
Idaho; C. J. Drake, Iowa; G. A. Dean, Kansas; Ray Hutson, Michigan; A. G. Rug- 
gles, Minnesota; A. L. Strand, Montana; 0. S. Bare, Nebraska; G. C. Schweis, 
Nevada; J. R. Eyer, New Mexico; F. D. Butcher, North Dakota; D. C. Mote, 
Oregon; A. L. Ford, South Dakota; \u W. Henderson, Utah; E. L. 'Chambers, Wis- 
consin; C. L. Corkins, Wyoming. 
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UBRARY 
STATE PLANT IOARD 
