516 BRITISH ORIBATID^. 



Abdomen oblong, rather longer and narrower in 

 form tlian that of N. horridus. It is raised above 

 the cephalothorax ; progaster almost straight ; hind 

 margin strongly concave, and without any onedian pro- 

 jection from a lower level. At each corner of the hind 

 margin is a chitinous, cylindrical apophysis bearing a 

 large, rough, curved hair covered with villous pro- 

 cesses ; a pair of similar, but much smaller, hairs pro- 

 ject from the ventral surface near the median line, but 

 are not always visible from above. The posterior 

 corners of the abdomen are, as it were, cut away at an 

 angle, the anterior end of the sloping edge bears an apo- 

 physis and a hair similar to those at the posterior end, 

 bnt smaller ; the space between these two apophyses, 

 which in N. horridus forms part of the hind margin, 

 appears in the present species to belong rather to the 

 lateral margin, which is straight in general outline, but 

 with the edge broken into two slight concavities, 

 and these again often irregularly indented. The 

 general level of the notogaster is flat, but the margin 

 is considerably raised, and the outer edge is the 

 highest part. A long loop-shaped ridge, or two longi- 

 tudinal ridges joined at the ends by transverse curved 

 ridges, but without any break or sharp angle, enclose 

 a median, longitudinal irregular space, which is much 

 wider posteriorly than anteriorly ; from the widest 

 part of this, i. e. where the longitudinal ridges join the 

 posterior transverse ridge, an oblique ridge runs out 

 to the truncated angle. The raised margin has 

 numerous, irregular, more or less transverse, raised 

 ridges. On the notogaster, close outside, but not on, 

 the longitudinal median ridge on each side, are four 

 small, curved, rough, pointed hairs, which spring from 

 apophyses, but these apophyses are much smaller than 

 those of N. horridus, and stand erect, instead of 

 horizontally as in that species ; the first is at the 

 anterior edge of the ridge, the second and third are 

 much nearer together than the first and second; this 

 trifling character appears very constant, and affords a 



