is common to parts of Europe. Asia and Africa, as one of the 

 destructive locusts belonging to those countries. 



While many of these locusts which belong to the genus 

 Schistocerca are very similar in general appearance, and it 

 is a rather difiicult matter for an inexperienced person to se- 

 parate the species as voladoiuts, or flyers, in the salloiui, or 

 hopper state, they differ so remarkably one from the other 

 that they can quite readily be distinguished even by a novice 

 in entomology. For example, the statement has been repeat- 

 edly made by writers of note that not only are the Argentine 

 locust ( piii'iiiieiisis ) and the large North American species 

 ( aniericaiia ) identical, but also that both of these and the 

 oriental {peregrina) belong to one and the same species. 

 An examination of the figures of both saltonas and voladoras 

 as given herewith (colored plate) will at once settle this ques- 

 tion. Even the insect which was described as Acridimu cmi- 

 cellcihtm and which is likewise quite distinct, as the saltona 

 would indicate, has been counted a synonym of the peregrina . 

 There are also several other well marked forms of these large 

 mottled locusts w^iich are to be met with in various parts of 

 tropical and semi-tropical regions of America and adjacent 

 islands. No doubt an examination of their saltonas would 

 likewise show them to be quite distinct from all of those named 

 above. 



The characters which separate the various species of Scliis- 

 toccrca, and \vhich are more or less permanent in each, are 

 such as the form and sculpture of prothorax; size of head; length 

 and size of prosternal spine ; comparative length and size of 

 hind thighs and shanks; amount and arrangement of tegmina 

 motlings ; comparative length of wings; and the general build 

 of entire insect which may be either robust or fairly slender. By 

 having large series of these insects from all over the earth be- 

 fore him the specialist would have no difñculty in making a 

 synoptic table for their easy separation. 



The various species of the genus to which our insect belongs 

 are also more or less alike in their general habits. In many 

 minor points, however, some of them differ quite materially 

 one from the other— often to such an extent as to render it 

 necessary to adopt special methods of warfare in dealing 

 with each. 



Without attempting to work out the full synonymy o{ para- 

 nensis at this time, or to enter more deepl}^ into a discuss>'on of 



