FURTHER RESEARCHES ON NORTH AMERICAN ACRIDIIOE 



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 



