Cyrtophora cicatrosa Stoliczka was reared from hatching to death at 4 different temperatures i.e. 22, 27, 32 and 37° C. A significant correlation is obtained between initial water content and hatchabiiity of the eggs. During embryonic development energy density and fat decreased but the water content increased. Fat was the main energy source for embryonic development. Of 0.34 gcal energy present in an egg, 29% is utilized on embryonic metabolism, 21% on postemergent activities.