554 IV AR TRÂGARDH 



the anterior margin of the sternal shield. The latter has 5 pairs 

 of small hairs, and projects backwards to the posterior margin 

 of coxse IV, which are placed very near one another, and, in 

 conséquence, the widthof the sternal shield at the truncated 

 posterior end is only two fifths of its greatest width, between 

 coxse II and III. 



The ventrianal shield is fused with the peritrematic 

 shields, very large, covering the entire belly, with the exception 

 of a very narrow strip ail round. Anal aperture small, 

 situated close to the posterior margin, 



Gnathosoma, The epistoma has a pair of small incisions 

 on the latéral edges, a little behind the middle (fig. 55). 



Themandibles (fig. 56) differ shghtly fromM. 's description. 

 Thus, the lower jaw is comparatively shorter, being not more 

 than about 3 times as long as the upper one, while in M, 's 

 spécimen it is 5 times as long as the upper one. Furthermore, 

 the thin blade running along the upper edge of the lower jaw 

 in its distal half is not so wide, and comparatively shorter ; 

 submarginally, a little behind the blade, there is a finely 

 pointed bristle inserted, a very remarkable feature, since to 

 my knowledge there lias so far never becn found a hair on the 

 lower joint. It seems, therefore, unlikely that we hâve to do 

 with a real hair, but rather with a hair-shaped, sessile appen- 

 dage of the jaw. 



Pilus dentarius (not delineated by M.) présent, submar- 

 ginally ; projecting obliquely forward and downward on to a 

 level with the top of the upper jaw. 



The legs (figs. 57-60). 



Tarsus I plentifuUy provided with tactile hairs and c( sen- 

 siUae » at the top, dorsally. The ambulacres (fig, 58) are of 

 a very charachteristic shape. The peduncle is deeply sunk into 

 a deep, sub ventral cavity of the tarsus, a very unsusual feature 

 which, to my knowledge, has not otherwise been met with 

 in the Parasitidœ. It is possible that the ambulacres are capable 

 of being retracted and protracted. 



