Track reading and direct observations on the locomotory behaviour of the spider Leucorchestris arenicola showed distinct differences between the sexes and between the different stages of their life histories. Adult male spiders make much longer excursions than do adult females and immature spiders, and paths of males are characterised by far less inward retracing of the outward path. Observations with infrared cameras and geophone equipment gave new insights into the signalling behaviour of this spider species and revealed so far unknown possible male-female signalling performed by the male spiders.