16 MISCELLANEOUS PUBLICATION 1348, U.S. DEPARTMENT OF AGRICULTURE 
rangeland types. Weather records can also be used 
to determine the average hours available for feed- 
ing during any summer day and for establishing 
similar conditions in the laboratory for feeding 
trials. This approach assumes that food preferences 
for the more important species are known. 
The objective of this study is to be able to derive 
a prediction equation to calculate forage losses with 
SELECTED 
ALEXANDER, G., and J. R. HILLIARD. 1964. LIFE HISTORY OF 
“AEROPEDELLUS CLAVATUS” IN THE ALPINE TUNDRA OF COLO- 
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ALLRED, B. W. 1941. GRASSHOPPERS AND THEIR EFFECT ON SAGE- 
BRUSH ON THE LITTLE POWDER RIVER IN WYOMING AND MONTANA. 
Ecology 22: 387-392. 
ANDERSON, N. L. 1961. SEASONAL LOSSES IN RANGELAND VEGE- 
TATION DUETO GRASSHOPPERS. J. Econ. Entomol. 54: 369-378. 
1964. SOME RELATIONSHIPS BETWEEN GRASSHOPPERS AND 
VEGETATION. Ann. Entomol. Soc. Amer. 57: 736-742. 
1972. THE ASSESSMENT OF RANGE LOSSES CAUSED BY 
GRASSHOPPERS. Pp. 173-179. In Proc. Int. Study Conf. 
Current and Future Problems of Acridology, 1970. C. F. 
Hemming and T. H. C. Taylor, Centre for Overseas Pest 
Research, London, XVI, 534 pp. 
and J. C. WricHT. 1952. GRASSHOPPER INVESTIGA- 
TIONS ON MONTANA RANGELANDS. Mont. State Col. Agr. Expt. 
Sta. Tech. Bul. 486, 46 pp. 
and E. HAsTINGs. 1966. 
CARA ELLIOTTI (ORTHOPTERA: ACRIDIDAE). 
Amer. 59: 718-719. 
ANDRZEJEWSKA, L., A. BREYMEYER, H. KaJAk, and Z. WOJCIK. 
1967. EXPERIMENTAL STUDIES ON TROPHIC RELATIONSHIPS OF 
TERRESTRIAL INVERTEBRATES. Pp. 477-495. In Petrusewioz, 
K., ed. Secondary productivity of terrestrial ecosystems 
(principles and methods). Vol. II. Warsaw, Panstwowe 
Wydownictwo Naukowe. 
BaILey, C. G., and P. W. RIEGERT. 1971. FOOD PREFERENCES 
OF THE DUSKY GRASSHOPPER, ENCOPTOLOPHUS SORDIDUS COSTALIS 
(SCUDDER) (ORTHOPTERA: ACRIDIDAE). Can. J. Zool. 49: 1271- 
1274. 
BALL, E. D. 1936. FOOD PLANTS OF SOME ARIZONA GRASS- 
HOPPERS. J. Econ. Entomol. 29: 679-684. 
1937. PROBLEM OF THE RANGE GRASSHOPPER. 
Entomol. 30: 904-910. 
BANFILL, J. C., and M. A. BRUSVEN. 1973. FOOD HABITS AND 
THE ECOLOGY OF GRASSHOPPERS IN THE SEVEN DEVILS MOUNTAINS 
AND SALMON RIVER BREAKS OFIDAHO. Melanderia 12: 1-21. 
BATCHELER, C. L. 1967. PRELIMINARY OBSERVATIONS OF ALPINE 
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BEI-BIENKO, G. Y. 1930. THE ZONAL ECOLOGICAL DISTRIBUTION 
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SOME NOTES ON REARING AULO- 
Ann. Entomol. Soc. 
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acceptable accuracy once key items concerning the 
population and environment are known. However, 
additional testing at various sites within a range- 
land type would be necessary to validate this 
approach. I hope that this plan of study will aid re- 
search workers, assist control personnel in evaluat- 
ing grasshopper infestations, and, eventually, re- 
sult in better management of our rangeland areas. 
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