Abstract
The T. pini species group in Typhlodromus Scheuten, which includes 10 spp., is described and discussed. Two new spp. are proposed: T. bisoni, which was identified as T. pini previously and T. mahri. The generic concepts of various authors concerning the species in the T. pini group are discussed and a key to and descriptions of the adult females of the group are given. Other species discussed include the following: T. greeneae, T. graminus, T. smithi, T. johnsoni, T. arboreus, T. arceuthobius and T. citri.