MEMOIRS OF THE NATIONAL ACADExMY OF SCIENCES. 51 



Chelicerae slenderer than in P. flavescens, the fingers rather longer ; the movable finger with 

 about twelve teeth on the inuer edge, the thumb with six obtuse teeth. Fedipalps slender ; the 

 coxa and basal joints much as in P. flavescens, but the spine on the inner side of the first joiut 

 twice as long; second joiut (female) scarcely thicker than the first, inner edge not so serrulate as 

 iu P. flavescens, the two large spiues twice as long as the joint is thick; the third joint a little 

 more than half as long as the second, with two long spines on one side and two unequal much 

 smaller ones on the other; fourth joiut but slightly longer than the fifth, with two large long 

 spiues on each side ; fifth and last joiut not so thick as the fourth, only two long spines on each 

 side, the terminal spiue two thirds as long as the joint itself. 



All the legs remarkably long and slender, eight jointed ; the tarsus five-jointed. 



First pair the shortest, not quite so long as third pair ; second pair about one-third longer 

 than the first, with remarkably attenuated tarsi, with a single weak claw; length, 18 mm ; third 

 pair with the coxal joiut larger than in any of the other pairs (first and second, and even the 

 fourth), aud considerably shorter thau the fourth ; fourth pair of legs very loug, but considerably 

 shorter than the second pair, with six tarsal joints, the last somewhat swollen, considerably longer 

 than the penultimate joint, and bearing two rather large, long, slender claws, and three long, large 

 setae. 



The ovipositor* is a very large organ, being 1.5 mm in length, or more than a third as long as 

 the body, and is as thick as the chelicerae or the third pair of coxae; it projects forward wheu fully 

 protruded (at least in alcoholic specimens) ; it is not chitinous, is muscular, not jointed, is slightly 

 curved, aud ends abruptly, with (as seen in profile, Fig. — ) about six fine setae on each side, those 

 on the extreme side being nearest together; these are probably tactile hairs (the eggs are prob- 

 ably laid in crevices). 



The penis differs remarkably from that of P. flavescens; it is rather thick when extended, and 

 slightly over l mm in length, or about one-third as long as the body ; the basal segment is not much 

 longer than broad, the second is over three times as long as the basal segment, of uniform width, 

 and divides at the end into two lateral slightly-curved points, and a longer, straight, acute pro- 

 jection; the sides are setose, especially towards the end, including the lateral horns. 



Length of body, 3 to 4 mm ; breadth, 2 to 2.5 mm ; of chelicerae, 2 mm ; of pedipalps, 5 mm . Labyrinth 

 and Dead Sea, Mammoth Cave (Packard); Dixon's Cave (Packard) ; Martha's Vineyard, Mammoth 

 Cave (Hubbard); White's Cave, several (Packard); Diamond Cave, Kentucky (Packard). 



Tellkampfs figure was crude and imperfect, as the second pair of legs were wautiug in his 

 specimens, which were evidently young, while the tarsal joints of the remaining limbs were not 

 correctly drawn; hence his description was incorrect as regards the limbs, as he says the length 

 of the limbs differs little. Professor Cope, having specimens of this species with all the legs 

 present, and basing his comparison with Tellkampfs genus on the latter's figure, copied by us in 

 the American Naturalist, founded his genus Phrixis on the character of the " multiarticulate tarsi," 

 although he says the tarsi of the u longest legs" were "not counted." His specimens were mature. 

 Mr. H. G. Hubbard gives an excellent figure of the female, which he incorrectly considers to be a 

 male. 



The following note on this species is copied from Mr. Hubbard's paper. 



Phrixis longipes Cope (Fig. 2). — In Professor Cope's description of this species {I. c. vi., 421) some confusion occurs 

 as to the tarsi. In the longest legs the number of joints was not counted, although they are mentioned as "multi- 

 articulate," and this, with the absence of eyes, is made to characterize the genus. 



In the specimeus before me the anterior and shortest pair of legs have five-jointed tarsi, ending in a single 

 claw, without an opposing bristle, as given by Cope; the second and longest pair have nine tarsal joints, with a 

 single claw; the third and fourth pairs are intermediate in length between the first and second, they have each six- 

 jointed tarsi and a pair of claws. The first tarsal joints in all the legs equals or exceeds the femora and tibhe; the 

 secoud joint, though shorter than the first, is very long. The palpi (that of the left side is omitted in the figure) 

 have live joints and a terminal spine; the basal joint bears a single spine; the second joint has five, three below the 

 middle, springing from the outer edge, two above, springing from the inuer edge; tho third joint has one on the 

 outer and two on the inner edges; the fourth joint has two external and three internal; and tho fifth, two spines on 



* This organ was mistaken by Mr. Hubbard in his description for tho penis and figured as such. Amer. Ent., 

 iii, 79. 



