NOTHKUS BIVERRUOATUS. 511 



smaller hairs. As to whether it is really the N. horrldus 

 of Nicolet and Berlese, see my remarks when treating of 

 N. Jiorridus (p. 505). I am rather inclined to think that 

 it is not, as, although there is a very great resem- 

 blance to Berlese's drawing, the single very small curly 

 hair on the great posterior papilla is so different 

 from the two great hairs which both he and Nicolet 

 figure and describe, that I cannot say that the species 

 are identical ; but the hair on my specimens precisely 

 agrees with Koch's figure and descriptions of his N. 

 hiverrucat'iLS. 



Colour brown, of medium depth ; the creature, how- 

 ever, usually covers itself up with dirt to such an 

 extent that neither colour, texture, nor markings can 

 be seen. 



Texture rough and dull; the whole creature is 

 thickly strewn with irregular, short, villous processes 

 of the cuticle, which are easily rubbed off, but when 

 in situ give a rough and granular effect. 



Cephalothorax partly hidden beneath the progaster, 

 very little narrower than the abdomen. Rostrum 

 small, conical, slightly truncated; gense distinct; 

 rostral hairs diverging, almost straight. Behind the 

 rostrum the cephalothorax suddenly widens, and rises, 

 forming a strong transverse edge slightly bowed for- 

 ward ; it then narrows again, being deeply excavated 

 for the insertion of the first pair of legs. From imme- 

 diately behind the before-named transverse edge spring 

 two large chitinous apophyses, convex on the outer 

 and concave on the inner edges of their proximal ends, 

 more cylindrical at their distal ends, which reach 

 beyond the tip of the rostrum. Each of these apophyses 

 bears a thick hair ; these hairs are nearly straight at 

 first, but curve inward at their distal ends and generally 

 cross ; hairs and apophyses are closely set with villous 

 processes. Pseudo-stigmata very projecting. Pseudo- 

 stigmatic organs very sliort and clavate, the head not 

 being so globular nor so distinctly marked off from 

 the peduncle as in N. horridus ; the heads are rough at 



