15 



SUB-FAMILY TETTIGINAE. 



This sub-famtly of locusts is represented in Argentina by 

 a comparatively small number of inconspicuous insects none 

 of which ever become sufficiently numerous to cause any 

 particular damage. They all live in rather damp localities 

 along the margins of streams or in the vicinity of swamps, 

 where they may be found in greater or lesser numbers upon 

 the mud flats. These insects are known as "Grouse Lo- 

 cust.s" and are represented in the Republic by less than a 

 dozen species belonging to the following genera as indicated 

 by specimens and records. They may be determined by 

 the table for the separation of genera as given herewith. 



TABLE OF GENERA. 



A. Front thighs more or less carinated above: front margin of pronotnm 

 in middle not advanced upon the back of head, 

 b. Body, even of the female, quite slender, the a])ex of pronotnm 

 greatly extended beyond the tip of hind femora. 



NKPHKLE Bolivar. 

 bb. Body in -both sexes obese, the apex of pronotum not at all or but 

 little extended beyond the tip of hind femora. 



PAKATETTIX Bolivar. 



AA. Front thighs not compressed, rather broadly and distinctly grooved: 



front margin of pronotum in middle angulate and advanced 



upon the occiput. TETTIGIDEA Scudder. 



GENUS NEPHELE, BOLIVAR. 



Xephele gracilis n. sjd. Closely related to N. fKir/ida Bol. but 

 considerably smaller. Antennae with last or terminal joint 

 the same color as the rest ; the vertex as in that species. 

 The pronotum extending nearly one- half of its length be- 

 yond the tij) of the hind femora, its median carina laminately 

 elevated in advance of the humeral angles. Color dark 

 brownish fuscous. In some specimens more or less marked 

 with the usual blotches of black and ochraceous on the disk 

 between the humeral angles. 



Length: of body, d", 6 mm, V , 8 mm; of pronotum, d' , 12 

 mm, ? , 13 mm; of hind femora, d, 2 mm. ? , 5.25 mm. 



I have seen specimens of this insect collected at Cordoba 

 (F. Schulz), and others from Paraguay and Territory of 

 Formosa, Argentina (Dr. H. Stempelmann). 



