The following post-mortem data will perhaps aid in giving a clearer idea of this curious little creature. The length of the body from the front of the cephalo-thorax to the end of the last post-abdominal segment was fifty-two millimetres--a little more than two inches; the length of the tail was fifty millimetres, thus making the total length about four inches. The width of the abdomen in its widest part, near the center, was thirteen millimetres, or approximately half an inch. The claw-bearing palpi, or "feelers," which are large and very powerful, have an extreme expansion of fifty-eight millimetres, nearly two and a half inches. The tail is a curious organ, and consists of forty-four short, jointed sections of a pale wine color, with a light yellow ring at the base; a few short, scattered pointed hairs are found on each segment. It is about two thirds of a millimetre in thickness at the base and tapers to about half this diameter at the end. When alarmed, the _Thelyphonus_ holds it curved over forward after the manner of the true scorpions; a habit that probably points to some common ancestor. Its true function appears to be that of an extra palpus or "feeler." The _Thelyphonus_ is generally of a wine color. In some places, as on the cephalo-thorax, this color is black; around the mouth parts, the legs, the sternal plate, and the under side of the abdomen, this wine color is very pronounced. The eyes are eight in number. Two of them are close together, on opposite sides of a slightly elevated ridge at the front of the cephalo-thorax. These eyes are bright, black, and beadlike, and about two thirds of a millimetre in diameter. A little farther back, on the outer edges of the cephalo-thorax, are placed the remaining six eyes, three on a side, in a triangular group. These eyes are not quite as large as those in front, but they are of a shining yellow color, and altogether give the face of the whip scorpion a decidedly uncanny look. But to return to the history of my pet. As Madam Thelyphonus had obviously been accustomed to rather primitive furniture, I did not overburden her new apartments. A thickly sanded floor, a salt dish filled with fresh water, a square of pine bark the size of my hand, slightly elevated, with a few nice pieces of green moss to remind her of the country home she had left, and my involuntary guest was ready for housekeeping. She accepted her new quarters without question or examination, and promptly retired to her bedroom under the bark.