Abstract
Surface structure of the egg-shell in the Japanese tusser and Chinese tusser was observed by means of scanning electron-microscopy. Fine structure of the egg-shell was similar to both of two moths, Japanese tusser and Chinese tusser. And the surface structure was as follows: Two layers of the petal-like pattern were observed around micropyle. At the surface other than the surroundings of micropyle (general portion), the egg-shell was composed of polygontal sectional part divided by the bank-like structure, aeropyles were observed to be covered with the barnacle-like processes (Japanese tusser) or the tulip-like processes (Chinese tusser). Changing courses of structure were observed between the surroundings of micropyle and the general portion.
