recognize our locust under almost any condition. The descrip- 

 tions and drawings will also enable the reader to separate the 

 Argentine locust from its near allies of both x\merica and the 

 (31d World. The colored plate at the front of this report will 

 show at a glance what the more detailed descriptions which 

 follow confirm. It will show that our insect as a full-grown sal- 

 tona is ver3' decided!}' marked, and that it is quite a pretty 

 insect as compared with its near allies. Its deep black face and 

 sides of prothorax will at once readily separate it from either 

 peyegi-iiKi or americana which have light-colored faces instead 

 and but little black on the sides of thorax. It can also be distin- 

 G'uished from (iiueviaiiKi bv its much larger head. The anicri- 



\'\iX. '-■'>. — Schistocerca paranensis: 

 nal JrawiiT;; b}' !■". IJurnicislcr. 



if sa liona. From orii^i- 



ccDia and peregrina can also be readily distinguished one from 

 the other. First, by the small sized head of the former as com- 

 pared with that of the latter; and secondly, .by their respective 

 colors. In americana the entire face, in fact the whole head 

 with tiie exception of vertex and a line below each eye, is 

 orange-yello^v, while in peregrina the face above the upper lip 

 only is yellow and the remainder of the head jet-black. Other 

 variations in color are also to be I'ound on thorax, legs, and 

 body, that readily separate the two insects as saltonas. 



Besides these color-variations there are structural differ- 

 ences, which, however, would be more noticeable to the 



