ACARINA FROM THE JUAN FERNANDEZ ISLANDS 



583 



middle. Maxillfe with two strong, rounded, dark-coloured teeth and with a trans- 

 verse suture in the distal ^/s; posterior hair inserted near the posterolateral 

 angle; anterior hair inserted in large pore near the median edge, a little behind 

 the suture. 



Hysterosoma only slightly arched, shield-shaped, oval in outline, but 

 slightly constricted near the antero-lateral angles which are sharp and project 

 forwards; the anterior margin is wavy (fig. 57). 



The dorsal side has a rather complicated sculpture; round the lateral and 

 posterior margin there is a narrow band of even width, which has numerous 



Fig. 53 — 56. Otocepheus pacifictis n. sp. 

 53. Riglit half of maxilla and palp. 54. Leg I. 55. Top of leg IV. 57. Leg IV. 



circular depressions which resemble minute areae porosae; similar light-coloured 

 depressions are found near the anterior margin and also near the posterior 

 margin; the central part of the shield has the same texture as that of the 

 hysterosoma but along the sides there run a series of irregular, wavy ridges. 



There are 5 pairs of fairly long, curved hairs about half-way between the 

 centre and the periphery and 4 pairs of submarginal short hairs in the posterior 

 half, the distance between the ist and 2nd being twice that of the distance 

 between the others 



Ventral side (fig. 58). Genital aperture small, placed far forwards be- 

 tween epimera IV and in front of coxae IV, a little longer than it is wide and 

 almost quadrangular, with two pairs of small hairs. Anal aperture large, twice 



