6 Annals of the Carnegie Museum. 



frequently given, and occasionally keys to the genera themselves have 

 been supplied. 



Order SALTATORIA. 



Part I.— Suborder LOCUSTOIDEA. 

 Locusts or Short-horned Grasshoppers. 



The insects, which are included in this suborder of the Saltatorial 

 Orthoptera, are very numerous and widely scattered over the surface 

 of the earth, wherever there is sufficient vegetation to afford them 

 sustenance and where they may find security against some of their 

 host of enemies. Of course, as might be expected, the species and 

 individuals are most abundant in warmer and more humid regions. 

 Nevertheless comparatively numerous representatives of the group are 

 to be met with in hot, arid regions, as well as in cooler countries 

 towards the poles. 



In the introductions to the sections dealing with families, contained 

 in former papers on these insects, I have written somewhat extensively 

 upon their life-histories, food-habits, and distribution. I will not 

 here repeat what already has been said upon these subjects. 



In the present paper over thirty supposedly new forms are charac- 

 terized. We may readily infer, that, when the entire South American 

 continent shall have been thoroughly explored, and its orthopterous 

 fauna collected and studied, there will be still many more species of 

 these insects discovered and made known to science. 



Family TETRIGID.*: (Acrydiida). 



The present collection contains a number of "grouse-locusts" 

 several of which appear to be undescribed. Undoubtedly considerable 

 additions remain to be made to our present knowledge of these inter- 

 esting little insects, so far as South American forms are concerned. 

 In 1910 the present author published in the Annals (VII, pp. 89-143) 

 a special paper on these insects based on a quite extensive collection 

 belonging to the Carnegie Museum. While that paper was not 

 intended to be a regular synopsis or monograph of the group under 

 consideration so far as South American forms are concerned, it was 

 nevertheless a rather full review. Since that time both the writer 

 and several others have added to that which was known about them 

 for the region. 



