The silkworm eggs of locally developed F1 hybrid were laid in spring 1989 at 26°C, stored at a temperature of 22 to 26°C for a period of 61 days and refrigerated at a temperature of 4 to 6°C for 93 days. These were treated subsequently with HCL solution of different concentrations at 48°C for a period of 6 minutes for their artificial hatching in autumn. Treatment with 20% HCL solution was found to be most suitable for obtaining maximum useful hatchability of 92.3% under local conditions.