REHN AND HEBARD 241 



large for the genus, nearly quadrate. Male cercus moderately 

 stout and rather short; with a long slender weakly incurved 

 ventral tooth, which is directed weakly proximo-ventrad, situated 

 just distad of the median point; above this tooth the shaft of the 

 cercus is produced in an overhanging shelf, which extends nearly 

 two-thirds the distance to the base of the cercus and is narrow 

 but evenly rounded in outline; beyond the tooth the shaft of the 

 cercus narrows regularly and rapidly to the sharply rounded 

 apex and is somewhat flattened vertically on inner side, not 

 depressed. No approach toward brachypterism is apparent, the 

 decided amount of variation in tegminal length in the twenty- 

 three specimens before us being due to a general greater or lesser 

 size development, which in this series we believe to be the result 

 of local environmental conditions. The caudal femora vary 

 similarly in length, cf 11-12.8, 9 11.8-14.8 mm.; the genicular 

 lobes are normally bispinose; the genicular areas are not darkened; 

 the ventro-external margins are armed in the eighteen perfect 

 individuals before us as follows: 



Number of spines, 1-1 1-2 1-3 1-4 2-2 2-3 2-4 



Number of specimens, 2 13 12 11 



Number of spines, 3-3 3-4 3-5 4-5 5-5 



Number of specimens, 2 4 2 1 1 



The dorsum of the abdomen bears on each side an indistinct 

 pale yellowish line. 



The localities represented in the typical series and the material 

 before us cover the entire known range of the species. The 

 localities represented by our series of twenty-four recorded speci- 

 mens are: Rio Grande do Sul, BraziP^- Sapucay, Paraguay; Mis- 

 iones, Buenos Aires, Chacras de Coria and San Ignacio, Province 

 of Mendoza, Argentina. We have but three unrecorded speci- 

 mens of the insect. 



Puerto Camera, Alto Parand. Paraguay, XII. 9, 19i:3. (C. Schrottkv), 1 9, 

 [A. N. S. P.]. 

 Carcarana, Santa Fe, Argentina, 1 cf , 1 9 , [.\. N. 8. P.]. 



^- Two females before us from this locality are paratypes, sent to the .-\cad- 

 emy of Natural Sciences by Saussure. 



TRANS. AM. ENT. SOC, XLI. 

 16 



