Quantitative analysis of the main metabolites (expressed as the total haemolymph and fat body contents of protein, carbohydrate and lirid) were carried out during the 3 rd. 5th and 6th day of 4th nymphal instar of S.gregaria topically treated with different concentrations of Chlorfluazuron (IKI;EC) and two different formulations of Triflumuron (Bay Sir 8514;and Sir 8514; FC)using colouremetric method. The mean values of the total haemolymph and fat body protein contents were reduced in nymyphs treated with Triflumuron, whereas the haemolymph and fat body protein contents were increased in Chlorfluazuron treated nymphs. A general increase in carbohydrate and lipid contents of the haemolymph and fat body was also observed in all treated insects.