GRASSHOPPER GLACIER OF MONTANA — GURNEY 323 



ACKNOWLEDGMENTS 



I am especially indebted for assistance in gathering information to 

 the following : D. G. Hall and Dr. J. R. Parker, of the United States 

 Bureau of Entomology and Plant Quarantine ; Dr. Irving Friedman, 

 of the United States Geological Survey ; Dr. Arthur Bevan, of the Illi- 

 nois State Geological Survey ; and Dr. William O. Field, Jr., of the 

 American Geographical Society. Others who have aided me materi- 

 ally are: Joseph S. Wade and Dr. Claude Wakeland, of the United 

 States Bureau of Entomology and Plant Quarantine; Drs. W. F. 

 Foshag and J. Brookes Knight, of the United States National Museum ; 

 Drs. Roland W. Brown, W. A. Cobban, William T. Pecora, John C. 

 Rabbitt, Louis L. Ray, and John B. Reeside, Jr., of the United States 

 Geological Survey ; Dr. Harlow B. Mills, of the Illinois State Natural 

 History Survey ; James A. G. Rehn, of the Academy of Natural Sci- 

 ences of Philadelphia ; Richard W. Westwood, of the American Nature 

 Association; F. C. Curtiss, Supervisor of the Custer National Forest; 

 and Dr. Erling Dorf , of Princeton University. To the National Park 

 Service, Department of the Interior, I am indebted for access to an 

 unpublished manuscript and photographs by Dr. W. C. Alden 

 (retired), of the United States Geological Survey. 



REFERENCES 

 Alden, William C. 



. Grasshopper Glacier. Unpublished manuscript in files of National 



Park Service, dated 1922. (Copy in files of U. S. National Museum.) 

 7 typed pages. 

 1930. Grasshoppers on ice. Nature Mag., vol. 15, pp. 379-382, illus. 

 1932. Physiography and glacial geology of eastern Montana and adjacent 

 areas. U. S. Geol. Surv. Prof. Pap. 174, pp. 1-133, illus. (See 

 especially p. 125.) 

 Baird, P. D., et al. 



1951. Report on the northern American glaciers. Assoc. Internat. Hydrol. 

 Scient, Assembl. Gen., Bruxelles, vol. 1, pp. 120-128. 

 Bevan, Arthur, and Dorf, Erling. 



1932. Red Lodge to Beartooth Butte and return. In Yellowstone-Beartooth- 

 Big Horn Region, XVI Internat. Geol. Congr., Guidebook, Excursion 

 C-2, pp. 43^7, illus. 

 Brett, Charles H. 



1947. Interrelated effects of food, temperature, and humidity on the develop- 

 ment of the lesser migratory grasshopper, Melanoplus mexicanus 

 mexicanus (Saussure) (Orthoptera). Oklahoma Agr. Exp. Stat. 

 Techn. Bull. T-26, pp. 1-50, illus. 

 Caudell, A. N. 



1902. Some insects from the summit of Pikes Peak, found on snow. Proc. 

 Ent. Soc. Washington, vol. 5, pp. 74-82. 

 Clyde, Norman. 



1930. The Beartooth Mountains of Montana. Amer. Alpine Journ., vol. 1, 

 pp. 174-181, illus. 

 Darrah, W. C. 



1951. Powell of the Colorado. 426 pp., illus. Princeton, N. J. 



