49G BRITISH OUIRATIDiR. 



N. sijlvestris exceptional, inasmuch as they are articu- 

 lated in large, tubular projections of the hinder divisions 

 of the sternal (or ventral) plate, as mentioned in the 

 descriptions of the genus. All the legs are rough and 

 granular. There are the following thick, slightly 

 curved, white hairs on the legs, viz. an irregular whorl 

 of three on each femur of the first two pairs, another 

 on the outer edge nearer the proximal end of that 

 of the second leg ; two, one inside, the other outside, on 

 each genual and tibia of the first two pairs of legs ; 

 one outside each joint except the tarsus of the third 

 leg and each of the three central joints of the fourth 

 leg ; three outside each tarsus, and two or three inside 

 that of the first leg. On the inside of the joints of 

 the hind legs the thick hair is often replaced by 

 one that is fine and short. The tactile hairs are small. 

 Tarsi sparsely furnished with fine hairs. Claws tri- 

 dactyle, very heterodactyle. 



Abdomen almost oblong, but slightly wider pos- 

 teriorly than anteriorly ; its lateral margins somewhat 

 curved and considerably raised, terminating posteriorly 

 in large rounded bosses, which fill the postero-lateral 

 angles of the notogaster. A marked depression divides 

 the raised margin from a somewhat arched oval, which 

 fills the central part of the notogaster, and is coarsely 

 reticulated (size of reticulations given above). Pro- 

 gaster raised, almost straight. Hind margin almost 

 straight at the dorsal level, but with a rounded pro- 

 jection below bearing a pair of thick hairs. Each 

 postero-lateral angle of the notogaster bears a very 

 long and powerful setiform hair, directed backward, 

 and curved, with the concavity inward; these hairs 

 are two-thirds the length of the abdomen. There is a 

 shorter but stout spine near the inner edge of each of 

 the bosses, directed backward and curving outward, 

 one on each lateral margin near the anterior corner of 

 the boss, and two or three smaller hairs inside the 

 margin further forward. There are two longitudinal, 

 curved rows of five hau'S on the median part of the 



