If you dream about katydids, then such dream indicates the danger. You should be aware of your own actions, otherwise you will lose the one you love. If you hear the katydids in a dream, then it shows your tendency to be dependent on others.

…Dreaming of hearing katydids, is a prognostic of misfortune and unusual dependence on others. If any sick person ask you what they are, foretells there will be surprising events in your present and future. For a woman to see them, signifies she will have a quarrelsome husband or lover….