512 BRITISH ORIBATID^. 



the ends. There are two curved longitudinal ridges 

 springing from near the pseudo-stigmata, which look 

 rather like rudimentary lamellae. Interlamellar hairs 

 extremely fine and small. The two first pairs of 

 apodemata long. Sternum scarcely developed. 



Legs of moderate length (the fourth pair scarcely 

 reaching the hind margin), thick, rough, gradually 

 diminishing in thickness, but each joint is slightly 

 enlarged at the distal end. From the dorsal aspect 

 the coxEe of the fourth pair are usually entirely, and 

 those of the third pair almost entirely, hidden by the 

 abdomen. Genuals and tibiae of about equal length, 

 the tarsi the longest joints. The legs are furnished 

 with short, curved, almost hooked, serrated hairs, 

 each of which springs from a small hut very distinct 

 chitinous apophysis; they are arranged about as follows : 

 viz. two or three on the outside of each femur, and 

 two on the inside of each of those of the first and 

 second pairs ; one on the outside of each genual, and 

 one or two on the outside, and one on the inside of 

 each tibia ; one on the inside of each genual of the 

 first and second pairs ; four to six on each side of each 

 tarsus ; four or five on each coxa of the third pair, and 

 one on the upper surface of each joint; the tarsi have 

 the usual fine hairs. Claws tridactyle, almost homo- 

 dactyle, but the central claw is the shortest. 



Abdomen oblong, raised above the cephalothorax. 

 Progaster very slightly convex. Hind margin with a 

 small shallow concavity on each side; at the inner 

 angle of which is a papilla, or wart : from the outer 

 side, not the end, of this wart, a small chitinous apo- 

 physis stands out laterally bearing a rather spatulate, 

 but not very large, curved hair, covered with villous 

 processes. Between these apophyses the abdomen 

 sinks down, and, for about the central third of its 

 width, becomes continuous with a large, median, fiat 

 projection from near the ventral surface. This projec- 

 tion has sides sloping backward and inward, and rather 

 over one-third in the centre of its hind margin is 



