Cauatlmti mntoinaloijbt. 



VOL. XXVI. LONDON, JULY, 1894. No. 7. 



A PRELLMI^ARY REVIEW OF THE NORTH AMERICAN i 



DECTICID^. 'I 



I 



BY SAMUEL H. SCUDDER, CAMBRIDGE, MASS. ! 



Having recently put my own collection of Decticida? into systematic ! 



order and treated the collection of the U. S. National Museum entrusted ; 



to me by Dr. C. V. Riley in a similar manner, I have thought it would i 

 assist in obtaining better material for a future monograph if I were to 



publish at least a generic discrimination of the material at hand. At the j 

 same time I am able to clear up most of the synonymy of the species and 

 assign to their proper location the various described species, very few of which 



(7 out of 23) will be found to have been originally placed in the genera to  

 which they are here assigned. This is partly because it has been neces- ' ' 

 sary to establish new generic categories for a large number of our species, 



which are very insufficiently known, having awaited a student ever since ; 



Herman's sketch of the genera of Decticidje twenty years ago. In the 1 



course of another year I hope to make a complete study, and not only to ^ 

 characterize the genera mor.e carefully, but to describe the numerous 

 species here indicated. It is evident that in the West a consideraMgr "^^X. 

 number of species are likely to occur additional to those now known/ tt^*' !>- • li 



. A 



W 



me, which number about fifty, divided among fifteen genera, five of which 



are monotypic, and only one of which is found also in the Old World/ ^ ,,._ 

 Much might be said regarding the geographical distribution of the genera> # t^ 



but I will reserve that for a future occasion. ' ^ ' <:. 



TABLE FOR THE DETERMINATION OF THE GENERA OF N. A. DECTIQIDJ:. .^-^ .' 



a I. Prosternum armed with two erect spines. \ _J 



b I. Four terminal spines on the lower side of the hind femor^ 





two smaller ones between a larger pair, 

 c I. Ovipositor straight. 



d I. Prosternal spines short, obtuse Engoniaspis. 



d2. Prosternal spines long and slender, sub- 



acule Atlanticus. 



