А qualitative study was made of the lipid components of eggs deposited Ьу engorged females of Boophilus decoloratus Koch. (Ixodoidea: Ixodidae), using thin layer chromatographic method. Spotting was done оп silica-gel plates, followed Ьу development in а mixed hexane: diethylether: glacial acetic acid medium, and staining with iodine. Colour reactions were also employed to confirm identification of the spots. Seven main types of lipids viz: phospholipids, free fatty acids, triglycerides, diglycerides, mопоglycerides, cholesterol esters, and cholesterol were found. Changes were noted in relative concentration of these lipids in eggs deposited sequentially bу each tick. In particular, cholesterol esters, diglycerides, and triglycerides showed significant depletion rates with progress of oviposition. Possible implications of the types and distribution of the various egg lipids in terms of hatching, natural history and control of the ticks are discussed.