The Leyden Museum of Natural History received a small number of Pieridae from the islands Pulu Babi and Simalur, collected by Mr. Edw. Jacobson. Mentioning eight species only, I call attention to the importance of this small collection, because two species prooved to be new and three other ones were represented by most interesting varieties. Especially the islet Pulu Babi seems to possess a remarkable fauna, deviating from that of the neighbouring islands. Pulu Babi is a coral-islet, totally overgrown with a dense, by people little visited forest. The following is an enumeration of the species received, with description of the novelties.