50 MEMOJJBS OF THE NATIONAL ACADEMY OF SCIENCES. 



pair, and one-third shorter than fourth pair ; the latter pair 8 mm in length, being of the same 

 length as the second pair, but with the basal joint longer, the last tarsal joint being subdivided 

 into but three joints. The penis is 1.25 mm in length, the basal portion not curved, the smaller distal 

 portion a little shorter than the basal, and ending in a corneous short cultriform thin appendage 

 with four subacute teeth on the outer edge. 



Length of body, not including the chelicene, 3 mm ; breadth, 2 mm . 



Subvariety Weyerensis. Those from Weyer's Cave, Virginia, all differ in habit from the 

 Wyandotte forms, and are easily distinguishable, as seen in male and female specimens from 

 Weyer's Cave. They are larger and darker, with brown specks, as seen in Plate XII, fig. — . The 

 second pair of legs, as compared with those from the Wyandotte Cave, are shorter and thicker. 

 The penis, however, is a little longer, being 1.5 mm in length, rather slenderer, and the cultriform 

 appendage differs a little in shape, while the basal half is much more curved at base. It should 

 be borne in mind that these differences are such as we would expect to meet with in individuals 

 from a smaller cave and one more liable to be reached from the outside world; and the differences, 

 moreover, are such as ally this variety to the more robust and out of-door forms. 



One specimen from a cave near Dismal Creek (collected by Messrs. Sanborn and Beckham) 

 was like Wyandotte specimens in size, and smaller than the var. weyerensis, but resembled" the 

 latter in color. 



Variety 2, ccecum, (PI. Xll) 10 males and females from the Carter Caves (Bat Cave) are 

 blind, the cornea being present, but with no retina. In all the specimens the cornea is 

 equalty colorless, and the individuals must be practically blind. The eye-tubercle is smaller and 

 blunter than in Wyandotte examples. The individuals are a little smaller and paler than the 

 variety weyerensis ; the pedipalps are the same, except that there appear to be two spines on the 

 inside of the second joint instead of one, as in tveyerensis and the typical forms from Wyandotte 

 Cave; the length and size of the second leg are identical with those of the typical Wyandotte 

 examples, being slenderer and slightly longer than var. weyerensis, but the third joint is setose ; 

 that of the Wyandotte specimens, at least in some cases, being without setae. The penis in coecum 

 is but slightly over l mm in length ; it is shorter aud smaller than in the Wyandotte and Wej'er 

 specimens, the basal joint shorter as well as the second joint, and the teeth on the cultriform 

 appendage are shorter and blunter. 



Remarks. — While, as observed above, the Weyer's Cave specimens are a pretty well marked 

 variety, aud are more like out-of-door forms than the Wyandotte ( :ave examples, and this would 

 be what we should expect to find in inhabitants of a larger and much deeper cave, it is singular 

 to find that the individuals of var. coecum from Bat Cave, which is a smaller cave and apparently 

 more open to daylight than Weyer's Cave, should be a more attenuated aud blind form. We 

 should naturally expect that the Wyandotte individuals would be blind. 



Phalangodes armata (Tellkampf). Plate XIII, figs. 1, la-lh. 



Phalangodes armata Tellkampf, Archiv far Naturgeschichte, X Jahrg., Bd. 1, 320, Taf. viii, figs. 7 to 10. 1844. 

 Acanlhoclieir armata Lucas, Ann. Soc. Eot. France. 1860. 



Wood, Proc. Essex Institute, 36. 1868. 

 Phrixis lougipes Cope, Amer. Naturalist, vi, 421, July. 1872. 

 Phalangodes armata Simon. Arachnides de France, vii, 156. 1879. 

 Phrixis lougipes Hubbard, Amer. Ent., iii, 39, Feb. 1880. 



Male and female. Body rather narrow and long compared with P.flavescens, being considerably 

 longer than broad; whitish straw-yellow, including the body and appendages, the young being 

 white. Cephalothorax considerably longer than broad ; the sides widen somewhat towards the 

 hinder edge ; they are not constricted near the middle ; the surface is moderately convex, and the 

 posterior edge is nearly straight and free from the abdomen, which is broad and short, but longer 

 and more pointed than in P. flavescens, with five segments to be seeu from above and six beneath, 

 the latter being the number of uromeres in the genus Phalangodes ; the last segment (seen from 

 above) is less than half as wide as the last one in P. flavescens, and is narrow and conical in shape. 



The eye-tubercle is about half the size of that of P. flavescens, and is conical in shape 5 there 

 are no traces of the eyes, either of a cornea or dark pigment mass, 



