628 PEOCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 



scutum. Antennae pilose, rather robust, 7-jointed, 5tli longest; next 

 longest in the 3d joint, then the 4th, 2d, Cth, 1st, and 7th, which last is 

 provided with two or three blunt, tactile processes at the tip. Segments 

 32, including the head; an impressed dorsal line as in Spirostrephon 

 cwsioanmdatus. Delicate and numerous impressed lines on the hind 

 margins of the dorsal scutes. Six bristles surmount each scute; two are 

 placed obliquely on each side, and another is closer to the median line 

 on each side ; the upper ones on the four penultimate segments are at 

 or near the posterior margin, and are shorter, blunter, and stouter; two 

 of them project backwards from the margin of the preanal scute. Ap- 

 parently no pores. Forty-seven i^airs of legs in cf , of which 45 are 

 of the normal shape; 1st, 2d, 3d, 4th, and 5th gradually longer; a 

 wide interval between the 5th and 6th pairs, the latter very robust, the 

 3d joint being much swollen and somewhat flattened inside, with the 

 terminal and basal joints stouter than in the remaining legs; 7th pair 

 weak, but normal ; place of copulatory apparatus iu the i)osition of the 

 8th; 9th pair 2-jointed, with basal joint very short, while the 2d is four or 

 five times as long and greatly swollen, looking in shape like a minute 

 melon, and is extended horizontally outwards the same as the similar 

 pair of organs in Tricliopctalum. Forty-eight pairs of legs in 2 ; appen- 

 dages of 3d segment aborted as usual ; sexual openings bounded laterally 

 by rounded elevations. Normal posterior legs slender and pilose. The 

 bristles on the back of the animal are received into basal sockets, and 

 when removed give the ai^pearance of a jiore with an elevated rim. A 

 yellowish substance adheres to the hairs in drops or beads in alcoholic 

 specimens, which may be the offensive secretion of the animal which 

 has exuded at the base of the bristles, though there is none of the char- 

 acteristic odor apparent to the smell. Length of the animal 8.5""". Color 

 nearly white. 



Of the above singular form I have received four specimens, three 

 males and one female, which were sent me by Dr. C. A. White, who ob- 

 tained them from the owner of Luray Cave, in Virginia, who had col- 

 lected them in the cavern himself. Some time last summer he sent me 

 specimens which, upon being subjected to a test with acetic acid, proved 

 to be only a calcareous crust which had been deposited over dead speci- 

 mens lying in the cave. These were collected by himself, and were in- 

 teresting as showing how pseudomorphs of organic forms might be de- 

 veloped in caverns. The acid, however, dissolved them completely, and 

 no vestige of the organic basis upon which they were molded remained. 

 I at first supiiosed them to be some form of Julus, but could not be cer- 

 tain. 



Out of nine related species known to inhabit this country but two are 

 blind, the other being the SpirostrejjJion {Scoterpes) copci Packard, which 

 inhabits Mammoth Cave, Kentucky. Another, which, according to Pro- 

 fessor Cope, inhabits Wyandotte Cave, Crawford County, Indiana ; Er- 

 hart's Cave, Montgomery County ; and Spruce Eun and Big Stony Creek 



