71 



The accompanying- illustration will give the reader an idea 

 of its general appearance. As its name implies it is of a 

 uniform grass-green color. 



Fig. 34. — Atrachelacriii unicolor (iiylio-Tos. — female. 



Fig. 3"i. — A. tniicolor. lualc, and ti]) of ahdomeii. 



GENUS DICHROPLUS, STAL. 

 The insects which comprise this extensive genus are very 

 closely related to one another in their general appearance, 

 and the few forms that have thus far been noted by 

 entomologists have been so briefly described that it is a little 

 doubtful as to their identity. This is especially true when 

 the student is limited in the material that is accessible for 

 study. However this may be, the writer, after considerable 

 study, has separated them into IB species for Aregntina. 

 Several of these occur in large numbers upon portions of the 

 pampa region, and sometimes cause much injury to the 

 grasses. They go by the general name of "tucuras, " which 

 w^ord I jDresume simply means "grasshoppers." 



TABLE FOR SEPAKATIN'i THE SPECIES. 



A. Female with the valves of the ovipositor emargiintely truiicato. In- 

 terval between the mesosternal lobes considerably longer tlian 

 witle. Male eerci moderately long, compressed back of middle, 

 beyond gently bowed, 

 b Prosternal tubercle large, transverse. Lower edge and inner face 

 of hind femora blood-red. General color dull brown. 



ob.sfuru Hrnncr. 

 bl). Prosternal tubercle not large, conical. Lower t-dge and inner 

 face of hind femora yellowish, 

 c. Smaller. General color olivaceous-yellow. Upper valves of 

 ovipositor much longer than the lower ones. clieiis Stal. 



cc. Larger. General color brownish-yellow. Upper valves of ovi 

 1 ( ; or but little longer than lower ones. 



leiuniscatus Slab 



