62 



GENUS CLARAZELLA, PICT. ET SAUSS. 



G. iMtagona Pict. et Sauss. This insect has been reported 

 from Bahia Blanca, near the boundary of Patagonia (Pictet 



et Saussure). 



GENUS TROPIDACRIS, SCUDD. 



T. cristata (Linn.) The "Langosta Negra" of Argentina 

 occurs throughout the various provinces bordering the 

 Andes mountains, where it sometimes joins the manga s of 

 Hclmtocerca 'paranensis as these drift over the country. This 

 insect does not, however, become sufficiently numerous to 

 commit depredations in cultivated fields. It has been 

 reported from San Louis, Rioja, Cordoba, Catamarca, 

 Tucuman, Salta and Jujuy. 



GENUS DIPONTHUS, STAL. 



TABLE FOR SEPARATING THE SPECIES. 



A. Tubercle of the prosternnm with the apex acuminate, retro-arcuate, 

 b. Grass-green. The tegmina immaculate: wings greenish-hyaline. 

 Pronotum with the posterior lobe one-halt' longer than the ante- 

 x-ior. Posterior tibia^ green, not dotted with black. 



electiis Serv. 



bb. Black besprinkled with yellow. Tegmina fuscous varied with 



yellow, wings dilute rose color. Pronotum with the posterior 



lobe not one-half longer than anterior. Posterior tibi:v dotted 



with black, the base and apex also black. 



claraziaiius Pict. et Sauss. 

 A A. Tubercle of prosternum straight, not retro-arcuate. 



b. Tegmina olivaceous or black and yellow, very densely punctate, 

 c. Body and legs not black spotted. 

 d. Apex of wings clouded, the veins fuscous. Base of ventral 

 segments black, 

 e. Larger. Posterior lobe of pronotum entirely greenish testa- 

 ceous, arg'eiitiiius Pict. et Sauss. 

 ee. Smaller. Posterior lobe of pronotum black except hind 

 border. Knees of hind legs, head and pronotum varietl 

 with i-ed. Scliulzi Bruner. 

 dd. Apex of wings hyaline, the veius greenish. Base of ventral 

 segments not black. perniistus Serv. 

 cc. Body and legs decidedly spotted with black, 

 d. General color greenish, varitd with yellow and lilack. 



comiuuiiis Bruner. 



dd. General color dull grayish-brown or dark olive, varied witli 



red and black. " pyciio.stictiis Pict. et Sauss. 



bb. Tegmina fuscous and yellow-marbled. 



c. Larger. Pronotum with posterior lobe one-half longer than the 



anterior, rounded behind. Body and legs spotted with black. 



iiigTO-coiisper.sus Stal. 



