Öz The intestinal bacterial flora of Locusta migratoria migratorioides R. and F. was investigated qualitatively and quantitatively in ali nymph stages and in adults obtained both from laboratory cultures and fresh material collected from the field, as well as from new cultures dating back to material collected from the same place, and comparisons were made of the results. As many as 1565 basterial cultures were isolated from 400 nymphs and adults who- se intestinal flora was investigated. These cultures were formed by 33 species of bacteria belonging to 6 families.