[Illustration: FIGS. 233, 234. Tegenaria medicinalis.--233, adult female enlarged four times. 234, cephalothorax of young female to show spots.] $Tegenaria (Cælotes) medicinalis.$--A large gray spider living in the woods, among rocks, in hollow trees, and under loose bark. It is half an inch long, with the legs of the female not much longer (fig. 233). The head is large and wide, and the eyes cover a little more than half its width. It is a little constricted in front of the legs and raised above the thorax as far back as the dorsal groove. The abdomen of the females is large and oval, widest across the hinder half. The spinnerets are small, but plainly two-jointed, and the upper pair longest. The general color is light yellow brown, covered with gray hairs, the cephalothorax browner, and the abdomen grayer, than the legs. The cephalothorax has two indistinct gray stripes. The abdomen is marked with a series of gray spots of irregular shape, smallest toward the front and larger and darker toward the end. The legs are faintly ringed with gray, more distinctly in the young. [Illustration: FIG. 235. Palpus of male Tegenaria medicinalis.] [Illustration: FIGS. 236, 237. Two forms of epigynum of Tegenaria medicinalis.] The males are as large as the females, with smaller abdomen and longer legs. The palpi have the patella and tibia short, not much longer than wide (fig. 235). The patella has a short process on the outer side near the end. The tibia is of complicated shape, as shown in the figure. The tarsus is twice as long as the tibia and patella together, with a long narrow tip. The palpal organ is large and complicated, with a long fine tube that can be seen from above, where it curves around the base of the tarsus. [Illustration: FIG. 238. Web of Tegenaria medicinalis in a hollow of a rock, the front edge held up by threads running across the hollow, and the mouth of the tube showing behind it.]