17 



T. niu/f/rostafa Bol. This insect is quite common from 

 Tucuman northward through the j^rovinces of Salta and 

 Jujuy. (Giglio-Tos. ) 



Tettigidea gracilif> n. sj). A beautiful, very slender, dark 

 br£)wn species with long pronotum in which the supplemental 

 carinae are continuous and nearly or quite as prominent as 

 the middle and lateral ones. Vertex somewhat advanced in 

 front of the eyes, the sides rounded, median carina promi- 

 nent, considerably advanced in front of the sides where it 

 unites with the frontal costa the sulcation of which begins 

 on a level with the vertex. Face somewhat oblique. Last 

 joints of palpi w^hite and very conspicuous. Pronotum 

 angulate in front and terminating in a rather prominent 

 spine which projects forward upon the occiput beyond the 

 middle of the eyes. Tegmina rather long, narrow, and pro- 

 vided with a whitish cicatrice near the apex which is 

 roundly and obliquely truncated from below. Valves of 

 the ovipositor unusually long, straight and slender, espec- 

 ially the lower pair which are dagger-like and almost with- 

 out teeth. 



Length: of body, 11 mm; of jDronotum, 18.5mm; of hind 

 femora, 5.5 mm. 



Only a single female specimen of this insect has been 

 seen by the writer. It was captured on some bags of grain 

 on the decks of a river steamer lying at anchor near the 

 wharf of Corrientes. 



SUB-FAMILY EUMASTACINAE. 



Thus far this sub-family is not definitely known to exist 

 by actual observation within the boundaries of the Repub- 

 lic ; but, since several species have been taken in the closely 

 adjoining portions of Paraguay and Bolivia, it may be taken 

 for granted that at least one or two forms will occur in the 

 northern portions, as for example the territories of Formosa 

 and Chaco, and the jorovinces of Salta and Jujuy. These 

 insects, like the representatives of the preceding sub-family, 

 never become sufficiently numerous to cause damage to 



