2 University of Michigan 



no attempt has been made to gather together these scattered 

 records ; this is in no sense a list of the Orthoptera of the 

 state, but is intended merely as a contribution to the knowl- 

 edge of its fauna. It makes no pretense to completeness ; 

 indeed, another season's work in the northeastern, southeast- 

 ern, and western parts of the state, where it is most urgently 

 needed, might easily add 15 or 20 species to the 78 here listed. 

 With the addition of previously published records, the num- 

 ber of species definitely known from the state must be in the 

 neighborhood of 85 or 90. The fact that the earlier authors 

 seldom gave a more specific locality than "Dakota" makes the 

 placing of many of their records difficult or impossible. 



All of the collections of the season of 19 1.9 were made by 

 Miss Olson with the assistance of Miss Thompson, those of 

 1920 in large part by the writer. A number of the specimens 

 which have been included in this report were taken by other 

 collectors, whose names are noted in the annotated list of 

 species. In this paper there is recorded a total of 4,805 speci- 

 mens from North Dakota and 39 from other localities, repre- 

 senting a total of 78 species. The entire collection is pre- 

 served in the Museum of Zoology of the University of Mich- 

 igan, with the exception of a synoptic series deposited in the 

 Biological Station at Devils Lake, and of a number of speci- 

 mens of species determined by Rehn and Hebard, which are 

 in the collection of the Academy of Natural Sciences of 

 Philadelphia. 



The writer wishes here to acknowledge his indebtedness to 

 Miss Crystal Thompson, under whose direction the work was 

 carried on ; to Dr. R. T. Young ; and to Messrs. James A. G. 

 Rehn, Morgan Hebard, and Dr. A. P. Morse, by whom a num- 

 ber of species were determined and many of the author's deter- 

 minations verified. Acknowledgments are also due in particular 



