272 STUDIES IN AMERICAN TETTIGONIIDAE (oRTHOPTERA) 



the very scarce forms, and on material from certain areas in the 

 wide distribution of other well known species. 



In 1898, Scudder revised the present genus, describmg several 

 new species and correcting certain mistakes in the nomenclature 

 at that time in general use. In a number of places, however, 

 his treatment is unsatisfactory, owing partly to the fact that the 

 importance of geographic races was not appreciated by him. 

 Other errors are attributable to that author's lack of knowledge 

 of certain species; these included his misconception of S. paronae 

 and his retention in the genus of the species forcipata, which 

 latter insect is a member of the allied but very distinct genus 

 Chloroscirtus. 



The present work is based mainly upon the material in the 

 Philadelphia collections and examination of the series in the 

 Museum of Comparative Zoology, the Morse Collection and the 

 United States National Museum. We are deeply indebted to the 

 following gentlemen who have assisted us greatly in various ways 

 during the preparation of the present paper: Prof. A. P. Morse, 

 Mr. A. N. Caudell, Dr. Samuel Henshaw, Dr. J. Chester Bradley, 

 Mr. William T. Davis and Dr. F. E. Lutz. The material before 

 us includes all of the known species of the genus and has enabled 

 us to correct a number of errors and ascertain more clearlj'' the 

 proper grouping of the species. This latter task is particularly 

 difficult owing to the numerous lines of development found in the 

 genus, as shown by the species which divide into numerous groups, 

 each containing but very few forms. These groups are six in 

 number: the first of these contains the primitive septentrionalis; 

 the second, pistillata, the three races of curvicauda and the very 

 aberrant strigata; the third, the anomalous and apparently' rather 

 primitive hemidactyla; the fourth, the specialized texensis; the 

 fifth, the two races of furcata and paronae and the sixth ungulata, 

 cuneata and mexicana. The correlation of these forms may be 

 graphically demonstrated as follows: — ■ 



