During the last years the interior of Surinam was explored by several little expeditions. Though topographic research was the maiu purpose of these expeditions, still biology profited by them, as in most cases the physician accompanying the expedition was charged with collecting. Dr. H. van Cappelle, who organized the first of these expeditions, explored the neighbourhood of the river Nickeri and its right tributary, the Fallawatra, in the last half of the year 1900, and penetrated as far as the mountains forming the watershed between Nickeri and Coppename. Being a geologist, he himself took care of the zoological department.