340 PROCEEDINGS OF THE ACADEMY OF [May,. 



Sohistocerca paranensis (Burmeister). 



1861. Acridium. paranense Burmeister, Reise durch La Plata Staat., I,, 

 p. 491. [La Plata Region.] 



Misiones. December 1, 1910. (No. 1.) ''Very common." One 

 male. 



Buenos Aires. May 6, 1907. One male, one female. 



La Carlota, Prov. of Cordoba. Elev. 142 meters. May 7, 1907. 

 One male. 



Alto Pencosa, Prov. of San Luis. Elev. 660 meters. February 

 2, 1908. One adult female, one immature male, one immature 

 female. 



Pedregal, Prov. of Mendoza. Elev. 696 meters. January 3, 1907. 

 One female. 



Mendoza, Prov. of Mendoza. Elev. 767 meters. December 

 12-13, 1907 and 1908. Three males, one female. 



Chacras de Coria, Prov. of Mendoza. Elev. 936 meters, 

 November 28, 1907; December 7-16, 1907. Three males, three 

 females. 



The La Carlota individual belongs to the peculiar dwarfed form of 

 the species. The Mendoza and Chacras de Coria series are very pale, 

 similar to spring specimens from Carcarana received from Bruner. 



*Atraclielacris olivaceus (Bruner). 



1911. Dichroplus olivaceus Bruner, Ann. Carneg. Mus., VIII, p. 133. 

 [Chapada, Matto Grosso, Brazil.] 



Misiones. January, 1911; January 12, 1911. (No. 35.) Two 

 males, one female. 



This species appears to us to be an Atrachelacris and not a Dichro- 

 plus as described. From A. unicolor it differs in the more elongate 

 and distad subfalcate cerci of the male, more compressed form, 

 broader fastigium, broader and distinctly sulcate dorsal section of 

 the frontal costa, shorter and smaller eyes and more mottled greenish 

 coloration. There is no close relationship of this form to A . gramineus 

 Bruner. *2 



In addition to the above specimens, we have before us a single 

 female from Sapucay, Paraguay (Hebard Collection), taken January 

 20, 1905 (Foster). The only difference worthy of note is that in the 

 Sapucay female the fastigium is even wider than in the Misiones 

 female. 



The localities from which the species is known are Chapada, Matto 

 Grosso, Brazil, Sapucay, Paraguay, and the Misiones, Argentina. 



^ Ann. Carneg. Mus., VIII, p. 129. This species equals A. unicolor Bruner, 

 1900 {nee Giglio-Tos, 1894). 



