ACARINA FROM THE JUAN FERNANDEZ ISLANDS 569 
is far forward in the anterior half and the other shields cover one another in 
such a way, that their anterior margins are close together, almost equidistant. 
Mouth parts (fig. 23). The hypostome is very large, almost twice as 
wide as it is long (13:7) with broadly rounded posterior margin and tapering 
forwards from the postero-lateral angles. It has the same reticulated texture 
as the dorsal side except at the margin. ‘The hypostomal hairs are rather 
short, straight and pointed and inserted as far from the median line as their 
own length and close to the anterior margin. 
The maxillze have a very peculiar shape; their basal portion is shaped 
as an irregular shield with reticulated surface and carries two pair of hairs, one 
straight near the anteromedian angle, the other is curved inwards and inserted 
in the postero-lateral angle. As I have pointed out (p. 560), the same structure is 
found in the genus Veolzodes, but, as far as I know, in no other Oribatei. Its 
presence in these genera possibly indicates a relationship between them. 
The mandibles (fig. 27) have no very characteristic features; the lower 
jaw has two strong terminal teeth and one similar tooth half-way between the 
top and the base, the upper jaw has one tooth op- 
posite the terminal teeth of the lower jaw and further 
back three rather blunt teeth. 
The palpi have the basal joint very short, 
ringshaped, the 2nd joint is the longest and has 
ventrally near the middle two long tactile hairs; 3rd 
and 4th joint of equal size, the former with one long 
hair dorsally, the latter with two hairs, one dorsal, 
one exterior, 5th joint of uniform width in the prox- 
imal 3/4, then suddenly tapering from the dorsal side; 
on this slope there are the usual three hyalin, short ee er, aN 
and straight hyalin bristles, forming a comb, and a ae sp. Dorsal shield. 
little further back dorsally a curved bristle on alow 
projection; ventrally and subterminally a pointed hair curved forwards and 
further backwards dorsally and exteriorly two slender tactile hairs. 
Ventral side (fig. 21) with almost the same reticulated texture as the 
dorsal side. Epimera I and II well demarcated, the former with three pairs of 
small, equidistant hairs near the anterior margin, the latter with only one pair 
in the median angle. Epimera III with only faint traces of their posterior mar- 
gin in the lateral half, with three pairs of small hairs. The posterior margin 
of epimera IV may be indicated by two faint, semicitcular ridges on a level 
between the genital and anal plates. 
Genital aperture rectangular, almost twice as long as it is wide, with 7 
pairs of small marginal hairs along the median edges of the genital plates. 
Anal aperture large, almost rectangular and nearly continuous with genital 
aperture, with two pairs of small marginal hairs near the middle of the median 
edges of the anal plates. | 
Legs (figs. 28—30). The legs are, as already pointed out (p. 556), quite 
unique through the structure of the articulation. As a rule, whenever there is 
a condylus developed which turns in a socket, the condylus is furnished by 
proximal end of the distal joint while the socket is furnished by the distal end 

