The present paper concerns some visible characters of Ceroplastes pseudoceriferus Green parasitized by four species of hymenopterous parasites. There is almost no difference in the body size in September between the healthy and parasitized scales. During August to April the body size of parasitized scale is not so large as that of the healthy one. Colour change of the underside of the parasitized scale does not occur until the parasite develops to the stage of prepupa. Ventral colour of the scale parasitized by Anicetus ceroplastis Ishii, Cheiloneurus ceroplastis Ishii and Tetrastichus sp. becomes dark brown finally and that of the scale by Coccophagus hawaiiensis Timberlake is faint orange. Dorsal colour of the scale parasitized by Anicetus ceroplastis Ishii is faint black, if the scale is young. These visible characters mentioned above may be often useful to detect the parasitized scales in the field.