The variations of moisture in the leaf litter of Eucalyptus tally with the fluctuations in the populations of microarthropods of the litter. The acarines and collembolans are the most numerous. We note at the end of the rains a spectacular rise in the rate of increase of psocids in this litter, as well as an obvious drop in the population of entomobryomorph collembolans (specific prey of Smithistruma) which have begun to penetrate the soil looking for moisture. An analysis of the sampling of prey carried back to the nest by foraging workers shows that, whatever the season, the capture of entomobryomorphs is the highest. In the rainy season, the majority of the prey are these entomobryomorphs; while, with the coming of the dry season, the rate falls to 31 then 21%. On the other hand, the foraging workers catch psocids, Acarina, and termite larvae by way of compensation.
