Nymphs of Aulocara elliotti (Thomas) were raised from the beginning of the first instar to the end of the final instar on the leaves of crested wheatgrass and western wheatgrass. The average C.I. the male grasshoppers fed on crested wheatgrass and western wheatgrass were calculated to be 0.9977 and 1.1094, respectively. Among the females those feeding on crested wheatgrass a C.I. of 1.0006 were recorded compared to 1.1733 on western wheatgrass. During this period the average G.R. of male grasshopper was 0.0848 on crested wheatgrass and 0.0813 on western wheatgrass. Female grasshoppers demonstrated a better G.R than males and the highest, 0.0943 was calculated for those fed on crested wheatgrass.