382 BEITISH ORIBATlDil';. 



Texture rough, not strongly cliitinisecl, rather more 

 leathery ; in this and in some other respects approach- 

 ing the genus Nothrus ; like many other Oribatidce 

 which have this texture and are thus not as fully pro- 

 tected as harder species, N. monilipes makes up for 

 the deficiency by covering itself with dirt to such an 

 extent that it is almost impossible to get it clean ; its 

 small size being an additional diflficulty. The figure 

 and this description are taken from carefully cleaned 

 specimens, otherwise many of the details would not be 

 seen. Another source of error which must be avoided 

 in identifying the species is, that the elevations on the 

 notogaster are apt to lose their form and to be difficult 

 to see shortly after death, particularly if treated with 

 reagents ; by care, however, the true form may be pre- 

 served. 



Cephalothorax and abdomen very sharply divided, 

 the former large and having a dorsum practically 

 divided into three regions, viz. firstly, the rostrum, 

 which is short and conical, not very sharp-pointed, and 

 carries small curved rostral hairs ; secondly, an almost 

 square plate-like region, bordered by the translamella 

 in front and the first pair of tectopedia laterally, and 

 divided into three parts by the lamellae. This region 

 is strongly reticulated, reticulations about 160 to the 

 millimetre, the ridges forming the reticulations rough 

 and not above one fourth of the width of the inter- 

 spaces ; this region has a slight transverse depression 

 about the centre. Thirdly, a transverse arch, or roll- 

 like region, over which the lamellae usually, but not 

 invariably pass, and which is generally rough with 

 raised dots or ridges instead of being reticulated. This 

 part bears the pseudo-stigmata. Lamellae very rough 

 thickened bars or ridges, almost parallel and near 

 together ; there is a sudden break in the middle of the 

 square region secondly above referred to and anterior 

 to this break the lamellae are a trifle further apart. 

 Cusps long, rough, curving doivnioard, and bearing 

 moderate-sized curved lamellar hairs ; if these cusps 



