Bruner : Sonii Amf.kican 'I'rtrigid.k. 119 



The genus Panihitix like Tclrix is a rather large one and the species 



are widely distributed over the earth's surface. Only a very few of thenir 



however, are found in South America. These may be separated as follows: 



.4. Body rather robust; pronotum not extending beyond the apex of hind femora. 



borelli Giglio-Tos. 



A A. Body somewhat slender; the apex of the pronotum extended decidedly beyond 



the tips of the hind femora. 



b. Larger (cf , 7-5 rnm., 9 , ii mm.); the apex of pronotum not greatly extended 



beyond the apex of the hind femora and tip of abdomen, .simoni Bolivar. 



bb. Smaller (cT. 6 mm., 9, 8 mm.); the apex greatly surpassing the tip of the 



abdomen and ape.x of hind femora gracilis Bruner. 



Paratettix borelli Giglio-Tos. 



Paratftlix borelli GiGLio-Tos, Boll. Mus. Zool. Anat. Comp. Torin., XII, no. 302, 

 1897, 28-29. — Bruner, Locusts of Argentina, 1900, 16. — H.\ncock, Genera In- 

 sectorum, fasc. 48, 1906, 56. 



Habitat. — This species is common throughout Argentina, especially 

 northward of Buenos Aires, and occurs also in Bolivia, Paraguay, and 

 adjoining portions of Brazil. Individuals are at hand from Corumba 

 and nearby localities. Some of these latter bear the label "highlands." 

 Carnegie Museum, Pittsburgh. 



Paratettix simoni Bolivar. 



Paratcllix simoni Boliv.\r, Ann. See. Ent. Fr., (6), X, 1900, 138-139. — Hancock, 

 Genera Insectorum, fasc. 48, 1906, 56. 

 Habitat. — X'enezuela, Co'ony Tovar. 



Paratettix gracilis (Bruner). 



Nephele gracilis Bruner, Locusts of Argentina, 1900, 15. 



Paratettix gracilis Hancock, Genera Insectorum, fasc. 48, 1906, 57. 



Habitat. — Paraguay, Argentina, Southwestern Brazil. 



This insect approaches some of the species of the genus AUotettix in 

 its general appearance, but has the posterior lateral angles of the pronotum 

 turned down, as shown by an examination of typical specimens in the 

 writer's collection. 



Genus Tetrlx Latreille. 

 re/r«x L.^TREiLLE, Hist. Nat. Crust. Ins., Ill, 1802, 284, part. 

 Acrydimn Geoffroy, Hist. Ins., I, 1762, 390. — Fabricius, Syst. Ent., 1775, 278. — 



Leach, Edinb. Encycl., IX, 1815, 120. 

 TeWtA; Fischer, Orthopt., Russ., 1846, 346, and others. 



The species of this genus are both numerous and widely scattered over 

 the world, but are confined for the most part to the regions north of the 



