402 BlilTISH ORIBATlDJi. 



legs have a tendency to be set outward. Tlie femora and 

 tibiae of the first and second pairs of legs are long, the 

 tarsi shortish ; in the two hinder pairs of legs the 

 femora are reduced, the coxse much larger, and the 

 tarsi longer and thinner. The claws are monodactyle, 

 and very large. The tactile hairs are long, and are 

 found on all the tibiae ; there are numerous hairs on 

 the tarsi, and some on the other joints, chiefly arranged 

 in whorls ; these hairs, when viewed by a low power 

 appear fine ; but when seen by an amplification of about 

 700 diameters they are found to be extremely various 

 in form, and to be most of them deeply serrated, in 

 difi'erent modes of serration. Two or three of the 

 hairs beneath each tarsus are lanceolate, and more or 

 less pigmented. From each tarsus on each side of the 

 claw springs a curious projection which by a low 

 power appears to be a short, chitinous rod pointing 

 forward, but a higher power discloses that they are 

 somewhat of the texture of the lanceolate hairs, though 

 stronger, broader, and shorter, more pigmented, trun- 

 cated, and deeply serrated on the truncated edge ; on 

 some tarsi there is one of these on each side of the 

 claw ; on other tarsi two on each side, one above the 

 other. Whether these projections be the homologues 

 of the absent side-claws may be worthy of considera- 

 tion, but I do not think that they are. 



Abdomen a short ellipse, slightly truncated behind, 

 and usually with small, paired incurvings of the lateral 

 parts of the progaster. The central portion of the 

 notogaster, between these incurvings, is occupied by a 

 pale spot or patch arising from the thinness and light 

 colour of the chitin in that situation ; this patch adjoins 

 the progaster. From the hind truncated end of the 

 abdomen spring two pairs of short, curved, fine hairs; 

 the inner pair are the longer. Genital and anal plates 

 far apart, almost oblong, the former very small and 

 placed far forward, the latter large, and near the hind 

 margin. 



