148 MR. A. D. MICHAEL ON UNRECORDED 



that the ridges left between the holes seem to form a fine network over the 

 inner cuticle ; the ridges are really narrower in proportion to the holes than 

 can be shown in a drawing the size of fig. 26. The chitinous plate bears 

 one pair of thick curved hairs just where the plate is narrowest, about one- 

 fifth of the length of the dorsum from its posterior end. 



Ventral surface. Legs inserted rather nearer the median line than the 

 lateral edge of the ventral surface ; their coxse, on each side, nearly tol^ch 

 longitudinally ; the space between the two lines of coxse as far as the posterior 

 edge of the third pair, and the median portion posterior to this point, is smooth, 

 like the median part of the dorsum, but the smooth part is wider than on the 

 dorsum and is irregular in form. The lateral and posterior parts behind the 

 third coxse are covered with irregular bands and curved surfaces coarsely 

 striated transversely. The genital opening of the ? is placed between the 

 coxae of the third and fourth legs, it is large and occupies almost the whole 

 space ; the genital plate (epigynum) which covers it is spade-shaped, straight 

 on its posterior edge, which is the shortest, slightly increasing in width toward 

 its anterior (distal) edge, which, as well as the lateral edges, are somewhat 

 curved. 



Legs. Of moderate length, the first pair set far forward, all joints 

 except the coxse passing the tip of the rostrum ; the fourth pair scarcely 

 passing the hind margin. The three posterior pairs of legs are normal ; the 

 first pair form the principal characteristic of the species, their coxse and 

 second joints are normal, but the other joints are extremely thin ; all these 

 thin joints, except the tarsi, are bordered, on each side, by a broad, flat, 

 transversely striated, chitinous expansion, about twice as wide as the joints ; 

 the most distal of these expansions is the narrowest. Each tarsus of the first 

 pair of legs is terminated by a long tactile hair, and there are a few fine 

 hairs on the other tarsi. 



Habitat. A single specimen from the Ruahine Range. 



EXPLANATION OF THE PLATES. 



Plate 17. 

 Fig. 1. Oribata Bostocki, sp. n. Dorsal aspect, x 55. 



2. „ „ Ventral aspect, X 55. 



3. „ „ Pseudo-stigmatic organ, x 100. 



4. Trachynotus sclerophyllus, sp. n. Ventral aspect, x 50. 



Plate 18. 

 Fio-. 5. Notaspis spinulosa, sp. n. Dorsal aspect, x 55. 



6. „ „ Pseudo-stigmatic organ, x 200. 



7. „ „ Claw, X 200. 



Fio"s. 8, 9, 10. „ „ Portions of the notogastral hairs (there are about 30 whorls. 



of spines on each hair), x 250. 



