IN i886 Battista Grassi2 described as the representative of a new order a remarkable arachnid which he found near the base of Mt. ZEtna in the campaagna of Catania, Sicily. Grassi's description was imperfect and seems to have excited little interest in his discovery till Dr. H. J. Hansen in I893 collected a number of specimens of the same species in southern Italy (near Palmi and Scilla in Calabria) and together with Dr. W. Sbrensen published a careful description of the external anatomy, with some good figures of the animal.3 During the past spring, while collecting specimens of Iapyx, Campodea, and Scolopendrella, in the vicinity of Austin, Texas, I