English: Plate VI.

Fig. 1. Pseudotremia cavernarum (Cope), from Wyandotte Cave, enlarged. — 1a, head; 1b, the same, front view; 1d, eyes. (Emerton del.) 1e, eyes of a Wyandotte Cave specimen; 1f, antenna much enlarged ; 1f', terminal joint highly magnified, filled with nerve cells, with numerous tactile setae, and two tactile or olfactory (?) rods at the end; 1g, under lip or dentomala (compare PI. VIII, fig. 1f, and explanation) ; 1h, labrum, with the three central teeth; 1i, external malella {mal. e), internal malella (mal. i), and labiella (lab); 1k, mandible of one side; 1m, the same on the other side ; 1n, six bundles of setae on the free edge of lm; 1o, eighth pair of legs; 1o', one of the legs enlarged; 1p, a leg of the first pair, next to the head ; 1q, a leg of the last pair; 1r, a pair of normal legs; 1s, male genital armature ; 1t, the same, different view ; 1u, end of the body ; 1v, a segment (dorsal view). Author del.

Fig. 2. P. cavernarum var. carterensia Pack., enlarged. — 2a, head enlarged; 2b, side view of another specimen, x6; 2c, dorsal view of a segment. Emerton del.