450 , BRITISH ORIBATIDiE. 



halves are a series of interlocking chitinous tabs or 

 teeth ; this can only be properly seen in dissections 

 looking from the inner surface. 



Legs rough, very thick and heavy, particularly the 

 two front pairs. The two hind pairs are set on pro- 

 jections of the ventral and lateral surfaces of the body. 

 The joints diminish in thickness from the femur on- 

 ward, the femora of the two front pairs being very 

 broad. The genuals are longer than usual, the tibiae 

 scarcely, if at all, longer than the genuals. The tarsi 

 rather long, with a slight elevation about the centre 

 carrying a secondary tactile hair ; in front of this point 

 the tarsus is concave above (figs. 7, 8). Claws very 

 strong. Tactile hairs on the first pair of legs mode- 

 rately long; on the other pairs short. There is a 

 whorl of spatulate hairs on each of the three central 

 joints of the first pair of legs, and on the femora of the 

 other legs, and a similar hair on the outside of each 

 genual and tibia of the three hinder pairs, and on each 

 coxa of the two hinder pairs of legs, and a strong, 

 curved, similar hair near the proximal end of each 

 femur of the first two pairs. These various hairs 

 appear only slightly spatulute when seen from above, 

 but in dissections under a high power it is surprising 

 to see how broad some of them are (fig. 9). 



Abdomen sharply divided from the cephalothorax 

 and elevated above it; it is a short ellipse, but some 

 specimens are rather elongated posteriorly. It is very 

 much arched, and is covered with large, irregularly- 

 scattered, raised dots, which average about ninety to 

 the millimetre, the spaces between being usually wider 

 than the dots ; these dots appear to be on the epi- 

 ostracum only, the endostracum being much more finely 

 granulated. There are six longitudinal rows of thick, 

 spatulate, yellowish-white hairs on the notogaster. 

 Ventral surface not so rough as the dorsal. Genital 

 and anal plates near together, occupying the whole 

 length of the ventral plate, about equal width, the 

 genital almost square, slightly widest anteriorly ; the 



