Neiv and Little Knoion South African ^u/ifiujce. 383 



which is attached at a point on its convex side to the inner side of 

 the mandible, and is movable in a vertical plane round the point of 

 attachment (fig. 6). Spiracles 4, large, exposed, situated on the 

 II. and III. ventral abdominal segments near their hind margins, 

 the anterior pair a little closer together than the posterior pair. 

 I. abdominal segment of the adult male provided below with a 

 large, sub-conical, genital papilla (fig. 3, g.p.), bearing at its apex 

 the sexual orifice. Eibbed area on inner face of mandibles very 

 large, the ribs very long, extending right up to the base. Rostrum 

 short, the upper lobe evenly pointed and not deflexed at the apex 

 (fig. 5), with the usual double row of adhering hairs at the apex 

 below (not drawn in the figure) ; the two lower lobes of the rostrum 

 contiguous to the apex, much longer than the upper lobe, strongly 

 compressed laterally, hairy, and furnished with the usual pair of 

 sub-apical feathery lingulae. 



The above diagnosis of the genus applies to the two species 

 described below, and probably also to H. fodicns Sim., which is 

 unknown to me. The enormous thoraco-abdomen is very peculiar, 

 and is similarly formed in the adult male and female and in the 

 young. Although the tergal segments are distinctly demarcated by 

 transverse lines, it is not easy to point out which of these lines 

 forms the boundary between the thoracic and the abdominal terga. 

 The anterior side of the thoraco-abdomen rises almost directly from 

 the hind edge of the head-plate, which it slightly overhangs (see 

 figs. 3 and 4). Five malleoli are present on each hind leg in the 

 adult, viz., two on the coxa, two on the first trochanter joint, and 

 one on the second trochanter joint (fig. 1 IV.). In the young 

 specimen of H. lanatus (Koch), measuring 13^ mm. in length, only 

 three are present, viz., two on the coxa, and one on the first trochanter 

 joint. According to Simon, H. fodicns, Sim., has only three malleoli, 

 and this statement has been utilised by Pocock in characterising his 

 new family Hexisopodidce (Ann. Mag. N. H. (6), xx., p. 250, 1897). 

 Simon's specimen is, however, evidently immature, the length of 

 the specimen in the figure being given by a line measuring not quite 

 14 mm.* (Ann. S. Ent. Fr. (6), vii., PI. vi., figs. 6 and 7 1, 1887). 



The principal points in which these remarkable Arachnids differ 



* In the text, however, the length is given us 23 mm., but this may be a 

 misprint for 13 mm. 



t A peculiarity of these two figures of Simon's should not be passed unnoticed, 

 viz., the omission of the first tarsal segment in the II. and IV. pairs of legs, 

 although it is plain from the text that this segment should be present. In fact, 

 the segmentation of the legs in fodicns is evidently similar to that of lanatus and 

 crassus. 



