ACARINA FROM THE JUAN FERNANDEZ ISLANDS 5383 
middle. Maxilla with two strong, rounded, dark-coloured teeth and with a trans- 
verse suture in the distal 4/3; 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 

56 

SS ye 
55 
Fig. 53—56. Otocepheus pacificus n. sp. 
gauaRieht half of maxilla ‘and palp: 54: Deg ds'*'55." Top’ af lee IV. 57). Leg ‘IV: 
circular depressions .which resemble minute arez porosz; 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 coxz IV, a little longer than it is wide and 
almost quadrangular, with two pairs of small hairs. Anal aperture large, twice 
