Öz Total and neutral lipids of the yellow meahvorm Tenebrio molitor L. (Coleoptera; Teneb- rionidae) larvae, which is one of the main stored product pest, were studied in the fat body, haemolymph and muscle. The lipid ccntent of the tissues was determined on the fresh and dry weight basis. The lipid compositions of the tissues was examined by Thin-Layer chromatography and phctodensitometry. Phospholipids were the prodominant lipids of the total lipids in haemoly­ mph and muscle, while triacylglycerols accounted for the majör lipids in the fat body. In tlıe neutral lipid fraction, diacylglycerols were the most abundant lipids of the haemol- ymph, whereas triacylylycerols were predominant in the fat body and muscle. Sterols, sterol esters and free faty acids were present as well as diacyIgycerols and triacylglycerols in ali the tissues examined. There were about two times more 1,2’diaclyglycerols than 1,3-diacylglycerols in haemolymph. Monoacylglycerols were not detected neither in fat bodynor muscle, while 1,3- diacylglyceroîs werc not present in fat body.