152 MEMOIES OP THE NATIONAL ACADEMY OF SCIENCES. 



Plate VIII. 



Fig. 1. Scoterpes copei (Pack.), enlarged. — la, transverse sectkm of the body, showing the origin of the legs beneath, 

 and, above, the position of the setiferous tubercles ; 16, front view of the head, J ; lc, antenna ; Id, the 

 same still more magnified ; le, terminal joint of the same, showing the position of the setae as seen in 

 outline, the nerve cells, and the three tactile or olfactory (?) rods (o. r. ) at the end ; sd, an abnormally enlarged 

 seta; 1/, under lip, or deutomala ; hyp., " hypostoma; " stip,i., internal stipes; stip,e., external stipes ; the 

 former bearing the labiella, lab., and malulella, the latter (external stipes) bearing the external (mal. e.) 

 and internal malella (mal.i.); la, end of the under lip highly magnified; lh, another view of the labiella 

 and stipes of one side ; li, genital of male, with the rudimentary eighth pair of legs (p), between which is 

 the genital armature (lie), more highly magnified at 11, having on each side a rudimentary lamina exterior 

 (I.e.), a, lamina interior (I. i.), and between them a stout spine, ending in a tuft of slender, stiff spinules; lj, 

 one of the two-jointed rudimentary feet, ending in a single claw ; lm, two o.f the lowermost etse on the 

 segment just behind the genital armature. 

 Figs. 1 and la were drawn by J. H. Emerton ; all the others by the author. 



Plate IX. 



Fig. 1. CambaJa annulata (Say), enlarged. — la, front view of head enlarged. Emerton del. 



Fig. 2. Cryptotrichus cwsioannulatus (Wood). (2a, eyes of a species of Julus) ; 26, antenna (from Alabama); 2c, the 

 last two joints enlarged ; 2d, antenna of specimen found two miles from Mammoth Cave, the last joint bear- 

 ing two terminal olfactory (?) rods ; 2e, a leg ; 2/, a pair of legs ; 2g, eggs, drawn in the same proportion as 

 Fig. 2. 



FIG 3. Lysiopetalum lactarium (Say), — Head and first four body-segments ; 3a, eyes ; 36, end of the body ; 3c, antenna ; 

 3d, last joint of the same with four two-jointed olfactory (?) rods ; 3e, a pair of legs; 3/, base of the same 

 enlarged ; ex., coxa ; st., one side of the rudimentary sternum ; 3g, one of the first pair of legs, with but four 

 joints, the last bearing a comb-like series of setae ; 3h, genital armature, $ , of one side; lam. e, lamina exte- 

 rior ; lam. i, lamina interior. 

 Figs. 2 and 3, with details, drawn by the author. 



Plate X. 



Fig. 1. JRhyncholophus cavernarum Pack.— la, the same drawn from another individual ; 16, two cheliceres and a pedi- 

 palp ; lc, end of third leg (second leg the same). All the figures much enlarged. 



Fig. 2. Lcelaps ? or Molostaspis ? loyandottensis Pack.— 2a, pedipalp; 26, end of first leg. 



Fig. 3. Lcelaps ( = Iphis ?) cavernicola Pack. — Highly magnified. 



Fig. 4. Gamasus (or Mypoaspis ?) troglodytes Pack. — 4a, mandible and pedipalp ; 46, end of first leg ; 4c, end of one of 

 the third pair of legs, side view ; the same, dorsal view. 



Fig. 5. Gamasus stygius Pack.. — 5a, cheliceres (mandibles) and pedipalps; 56, end of second leg ; 5c, end of a pedipalp. 



Fig. 6. Sejus ? sanborni Pack. — 6a, mouth-parts and first pair of legs. 



Fig. 7. Damaus bulbipedatus Pack. J. H. Emerton del. 



Fig. 8. Perhaps the nymph of the preceding (Troussart), or a species of Hypoaspis (Michael). J. H. Emerton del. 



Fig. 9. Uropoda lucifugus Pack. J. H. Emerton del. 



All the figures, except 7 and 9, drawn by the author with the camera lucida. 



Plate XI. 



Fig. 1. Bryiobia f (or Penthalwus ?) iveyerensis Pack.— la, end of first leg; 16, end of second leg 



Fig. 2. Oribata alala Pack. — Dorsal view ; 2a, the same, ventral view. Emerton del. 



Fig. 3. Chthonius packardii Hagen. — 3a, drawn from a younger specimen (Emerton del) ; ?i tueiicered (mandibles) ; 

 3c, one of the cheliceres, showing the coinb-like appendage, or serrula (s.) within at the base; 3d, the same 

 enlarged ; 3e, barbed setae on the chelicera ; 3/, a pedipalp (chela) ; 3g, one of the first pair of legs ; 3/t, end 

 of 3g ; 3i, a fourth leg ; 'Sj, end of a fourth leg. Author del. 



Fig. 4. Chthonius ccecus Pack. — 4a, cheliceres of right side; 46, pedipalp (chela) ; 4c, a "finger" of 46. 



Plate XII. 



Fig. 1. Phalangodes flavescens (Cope), from Wyandotte Cave. — la, the eyes seen from above ; 16, the ocellar eminence 

 with the eye at the base ; lc, section through the same, involving one eye ; lc', section through the lens 

 and retina of the eye ; lc", eye of example from Wyandotte Cave ; lc'", seen sidewise in var. caecum ; Id, a 

 chelicer ; Id', musculature of the same ; le, a pedipalp, showing also its muscles ; 1/, last three tarsal joints 

 of the fourth leg (the claws not well copied by the lithographer) ; lg, end of one of the second pair oi 

 legs; lh, a second leg from a specimen from Weyer's Cave ; li, li', one of the second pair of legs, of exam- 

 ple from Senate Chamber, Wyandotte Cave; lj, the same from the same locality; lfe, the same from Bat 

 Cave (Carter Caves); 11, first tarsus of example from Weyer's Cave ; lm, penis of a Wyandotte example 

 ending in four teeth, the fourth the longest; In, lateral view of penis of P. flavescens, var. cozcum; In', In.", 

 other views of the same, with the muscles of the second joint. 



