The task of preparing and illustrating a work upon the Butterflies of Japan, after the model of Mr. Distant's Rhopalocera Malayana, has been undertaken by Mr. H. Prye, of Yokohama, who with persistent enthusiasm for the past seventeen years has been engaged in collecting the Lepidoptera of the Empire, and studying their habits. The work, entitled Rhopalocera Nihonica, will appear in three parts, 4to.

Egg.—Shape of flattened sphere. Diameter, 1 mil. Color, brownish slate. There are thiry-six vertical ribs, each alternate one only reaching the apex; and numerous horizontal parallel stritations. The eighteen ribs which reach the apex there unite with the horizontal lines, forming an irregular network. Duration of this period 241 to 246 days.

Mr. Alfred Wailly, Tudor Villa, Norbiton, Surrey, England, is anxious to obtain speciments of the wild Silk-worms of all parts of the world for exhibition in the Department of Sericulture at the Paris International Exhibition of 1889. In order to make the exhibition as complete as possible, he wishes to obtain specimens of live cocoons, in large quantities or small, with names of food-plants for each species, whenever possible, and also specimens of the moths; any specimens went will be purchased or exchanged, as desired.