160 STUDIES IN AMERICAN TETTIGONIIDAE (oRTHOPTERA) 



and spartinae are so similar in general appearance that they long 

 remained unrecognized in collections as very distinct species. 



Distribution (over the region under consideration). — The 

 present genus is found everywhere in Canada as far north as ade- 

 quate collecting has been done and probably extends in distribu- 

 tion northward at least as far as the spruce belt. It is also found 

 everj^where in the United States; l^ut in the semi-desert and desert 

 regions of the west it is confined to mountains, rivers, streams, 

 lakes and irrigated tracts where a more constant water supply 

 is to be found. The genus is found in the greatest numbers in 

 the Mississippi Valley region and in the central Atlantic states. 



Material Examined. — In addition to a series of over 1000 speci- 

 mens already correctly recorded, we have examined and recorded 

 in the present paper 2907 specimens, of which 1924 are in the 

 Hebard Collection and that of the Academy of Natural Sciences 

 of Philadelphia. For the privilege of studying the additional 

 material we wish to express our deep appreciation to Mr. A. N. 

 Caudell, of the United States National Museum and to Dr. 

 Samuel Henshaw, of the Museum of Comparative Zoology, who 

 have enabled us to study all of the material in the collections of 

 those institutions, to Prof. A. P. Morse who has generously 

 requested us to study and record the interesting series in his col- 

 lection taken by him outside of New England, and to Mr. Wm. 

 T. Davis and Dr. J. Chester Bradley whose careful w^ork in the 

 field and kind cooperation has greatly assisted us in this and other 

 studies. The privilege of studying and recording the material 

 belonging to the Pennsylvania State Department of Zoology 

 has also aided us in the present work. 



In the preparation of the present paper the following types have 

 been before us: 



Conocephalus allardi (Caudell) 



Conocephalus fasciatus vicinus (Morse) 



{Xiphidium vicinum var. productum Morse, synonym of Cono- 

 cephalus fasciatus vicinus (Morse).) 



Conocephalus spinosus (Morse) 



Conocephalus gracillinius (Morse) 



Conocephalus brevipennis (Scudder) 



{Xiphidium ensifer Scudder, synonym of Conocephalus brevi- 

 pennis (Scudder).) 



