The salivary glands of the flesh fly Sarcophaga bullata become filled with a clear oily fluid before pupation. At 34 h (with pupal head eversion occurring at 36 h, with breeding at 25°C) there is an emptying of the salivary glands, coincident with antiperistalsis and filling of the mid-gut with a similar oily fluid. It is suggested that a similar process, representing in this instance a 2nd phase of secretory activity, occurs in Drosophila and that it can be correlated with a 2nd phase of chromosomal-puffing activity.