FURTHER RESEARCHES ON NORTH AMERICAN ACRIDIID^E 



By ALBERT PITTS MORSE, 

 Research Assistant, Carnegie Institution of Washington. 



INTRODUCTION. 



The following report is based upon data obtained during a second 

 field trip of ten weeks' duration in the summer of 1905 under the 

 auspices of the Carnegie Institution of Washington, and forms a 

 partial field study of the Acridian fauna of the central Southern States. 

 A large amount of material and of biological data and several unde- 

 scribed forms were secured. 



ACKNOWLEDGMENTS. 



To the Trustees of the Carnegie Institution of Washington I wish 

 to express my deep appreciation of the liberality which has enabled 

 me to conduct these investigations. I desire also to express my in- 

 debtedness to Drs. B. L. Robinson and M. L. Fernald, of the Gray 

 Herbarium, for the determination of plant specimens; to Mr. A. N. 

 Caudell, of the United States National Museum, for aid in identifying 

 material; to Mr. Samuel Henshaw for favors received in connection 

 with the examination of material in the Museum of Comparative 

 Zoology; and to him and Mr. S. H. Scudder for their unfailing 

 interest and encouragement in this work. 



PURPOSE, METHODS, AND OUTLINE OF TRIP. 

 PURPOSE;. 



The purpose of the second trip, which was undertaken in con- 

 tinuation of the work of the first, was primarily, like that, to secure 

 general information regarding the North American locust fauna and 

 its ecology over a wide extent of relatively little-studied territory. 

 Such information once secured (as is now the case for the greater part 

 of the country), further effort bearing upon details of taxonomy, dis- 

 tribution, ecology, and variation can be more wisely directed, 



METHODS. 



The general information needed can be most effectively secured 

 by a rapid reconnaissance or sampling process, visiting as many points 

 of widely varying physical condition in the territory under examination 



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