New British Oribatidse. By A. D. Michael. 393 



A species recognizable by the form of the pseudo-stigmatic 

 organs. 



Colour and texture as in N. juncta. 



Eostrum conical, rounded at tip, cephalothorax behind rostrum 

 would be square were it not for a slioht constriction in the middle. 

 Kostral hairs short ; palpi projecting. No lamellae nor trans- 

 lamella. Pseudo-stigmatic organs nearly erect, rather long, with 

 thin, filiform peduncles and short, flat, pyriform heads, from which 

 some stiff bristles, about as long as the heads, radiate. Inter- 

 lamellar hairs shorter than pseudo-stigmatic organs. Legs rather 

 long ; fourth pair reaching considerably beyond the hind margin. 

 Femora slim, without blades. Claws monodactyle. 



Abdomen elliptical, the breadth of the elhpse varies considerably 

 in different specimens. Two longitudinal rows of fine hairs on 

 notogaster, and a series of similar hairs near the margin. Genital 

 and anal plates far apart, nearly square, the latter much larger 

 than the former, 



NOTASPIS QUADEIOARINATA Sp. nOY., plate VII. fig. 7. 



A thick-set species remarkable for the ridges on the abdomen. 



Colour and texture as in N. juncta. 



Cephalothorax long and large; about five -twelfths of total 

 length, forming a truncated cone. Eostrum blunt, rounded ; rostral 

 hairs short. Lamellae strong, clearly-marked ridges, almost blade- 

 like, short, slightly undulated, without cusps, but ends joined by a 

 very strong trans-lamella. Pseudo-stigmatic organs short, slightly 

 recurved, with thick fusiform heads on short peduncles. A short, 

 doubly curved ridge starts above the insertion of each first leg and 

 terminates a little in front of the lamella. The pseudo-stigmata 

 are joined posteriorly by a transverse ridge. Legs short and thick ; 

 femora without blades ; claws monodactyle. 



Abdomen short and arched, truncated anteriorly. There are 

 four longitudinal ridges on the anterior part of the notogaster ; the 

 central pair turn at right angles and run a short distance along the 

 anterior margin and then return and run parallel to their original 

 course, looking like two shorter extra ridges. Four sparse rows of 

 short hairs on notogaster. Genital and anal plates large, near 

 together, almost square. 



