HANCOCK 3 



of East Grinstead, England, came the gift of interesting exotic 

 species, valuable for comparison. To Professor J. G. Need- 

 ham, Lake Forest University, the author is under obligations 

 for the determination of certain points in the tracheation of 

 the wings. Through friendly association or contributions 

 of series to my collection may be mentioned Professor W. M. 

 Wheeler, University of Texas; Professor W. S. Blatchley, In- 

 dianapolis, Indiana; Dr. F. W. Goding, New South Wales, 

 Australia; Professor M. J. Elrod, and C. C. Adams, Blooming- 

 ton, Illinois; Dr. R. W. Kunze, Phoenix, Arizona; Professor 

 C. F. Baker, Auburn, Alabama; Dr. Martin Matter, J. E. 

 McDade, and Professor O. S. Westcott, of Chicago; Dr. Hugo 

 Karl, Lawrence, Kansas; C. F. Adams, Atherton, Missouri; 

 O. W. Barrett, Mexico; R. J. Crew and E. M. Walker, of 

 Toronto, Canada; B. T. Gault, Glen EUyn, Illinois; the late 

 A. Bolter, of Chicago; and Professor Otto Lugger, of St. 

 Anthony Park, Minnesota, also now deceased. 



Foremost in laying the foundation of our present systematic 

 knowledge of the Tettigidre was the admirable essay (1887) of 

 Professor Ignacio Bolivar. Upon this work more than any 

 other the writer has based the present 'systematic studies. It 

 will be observed that, through lack of adequate material at 

 that time, the species of North America were not treated 

 thoroughly and the identity of species was more or less con- 

 fused. But as a notable general contribution the work of 

 Bolivar stands as a classic. Pearlier writers described here 

 and there an isolated species. Those who have enriched the 

 subject may be mentioned: Say, De Saussure, Burmeister, 

 Harris, and Scudder. Notable among the more recent contri- 

 butions are several by my colleague, Mr. A. P. Morse, whose 

 systematic studies of North American and Central American 

 species have been the most important. Citations from other 

 observers will be found in the body of this article. 



ORIGIN OF THE NAME TETTIX. 



The genus Tettix was first known by the appellation Tetrix, which was given by 

 Latraille (1804) to a well defined group of Acridians, which in succeeding? years became 

 known under various names, but we recognize these insects from the time of Linnaeus 

 {1764). whose figures are unmistakable. T. bipunctatus and T, subulatus oi Europe were 



