QQ MEMOIRS OP THE NATIONAL ACADEMY OP SCIENCES. 



Specimens from Weyer's Cave and the adjoining Cave of Fountains were just like those 

 in the Carter caves, being white, with small black eyes, and dull purple leaden antenna? and tarsi. 

 Those in the New Market Cave were white, with black eyes and dark lead colored antennae. 



In One Hundred Dome Cave, specimens said to have been collected one quarter of a mile 

 from the entrance were all dark, of the usual out-of-door plumbeous color. 



Remarks. — It is evident that the var. pallidus has been produced by the influence of its cave 

 life. Var. pallidus occurs in a cave near Salt Lake, Utah, and the specimens do not differ from 

 the bleached ones in the Kentucky and Virginia caves. The trunk becomes bleached, while the 

 extremities of the antenna? and legs retain somewhat of the colors of the out-of-door form. None 

 have been found without eyes. The shallowest caves, such as the ice-house cave, in Carter county, 

 Kentucky, as well as the deeper ones, possess this variety. We also find the normal plumbeus in 

 similar caves, though probably near daylight, but the inference that the pale bleached variety has 

 been produced by want of light is a natural and the only possible one. It is proved by finding 

 in Zwingle's Cave a slightly-changed plumbeus associated with numerous pallidus. 



Lepidocyrtus Atroptjrpuretjs n. sp. Plate XVI, figs. 3, 3a, 3b. 



Body dark leaden-purple; eyes large and distinct; antenna? smaller and shorter than usual, 

 but little longer than the head; the fourth joint equal in length to the second and third together. 

 The last pair of legs with rather long scales, rather slenderer than in L. marmoratus Pack.; the 

 larger claw not very broad, in this respect differing from L. metallicus Pack., and being more as 

 in L. marmoratus ; the single teneut hair about as long as the inner smaller claw. The terminal 

 joint of the spriug (elater) is very short; the middle tooth much shorter than the terminal one, 

 which is also short compared with that of L. metallicus. 



Length of body, without the antenna? and spring, l mm . Diamond Cave. 



The species is described from alcoholic specimens in which the hairs have been rubbed off. 

 In color it seems to be near L. metallicus; like that species it is stout bodied, and has short 

 antenna?, but in the present species the antenna? are still shorter, the entire antenna? being scarcely 

 longer than the head; in this respect and the shape of the end of the elater the present species 

 differs from any of the other described forms. 



Degeeria cavernaktjm n. sp. Plate XVI, figs. 2, 2a-2g. 



Whitish; with a slight yellowish tint; usually blind; no traces of eyes. Body of the usual 

 form; antenna? of great length, two-thirds as long as the body and more than twice as long as the 

 head; basal joint longer than usual; fourth joint very long and slender. Legs: last joint with 

 fine slender scales; the claws much as in D. grisea Pack., but the spines on the larger claw are 

 less distinct and the tenent hair shorter; the spring long and slender; the second joint serrulate 

 along the under side nearly to the base; third (terminal) joint long and slender, ending in three 

 teeth; the terminal tooth claw-like, as usual. The collophore (Fig. 2c) is large and well developed. 



Length of body, without the spring, 3 mm . 



Fig. 2 represents an average specimen from New Wyandotte Cave, where we found this 

 species in great abundance. It also occurred in Bradford Cave, Indiana; in general form and 

 color it was like the New Wyandotte form, but as seen in Fig. 2c the antenna? are much shorter, 

 especially the fourth joint; also the end of the spring is slenderer. It has no eyes ; the body is of 

 the same size, and the feet nearly the'same. While the Lepidocyrtus may be only an occasional 

 visitor to the cave in which it was found, the present species being eyeless and bleached, besides 

 being very numerous, is, without doubt, a true troglodyte. 



Specimens found in the Carter caves, especially Zwingle's, about one-quarter of a mile from 

 daylight, had antenna? (Fig. 2&)with the fourth joint slightly longer than in the Bradford Cave 

 examples, but much shorter than in those from New Wyandotte; and the spring (Fig. 2g) is less 

 hairy. It also occurred in Bat Cave, the specimens being certainly eyeless. 



Specimens from Diamond Cave (Fig. 2d) were identical in form, color, and length of antenna? 

 with those living in the Carter caves. The color did not noticeably vary in specimens from any 

 of the caves. 



