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ACARINA FROM THE JUAN FERNANDEZ ISLANDS 611 
lines of which the 5th is obliterated in the middle, and has 3 pairs of bristles 
round the margin and 3 circumanal bristles. 
The mouthparts. The epistome (fig. 124) has the usual fishtail shape. 
The lateral lobes have, as far as I have been able to find, even edges and 
taper gradually towards the top, their anterior edge forming an almost straight 
line. The median lobe is fine and slender and branches off into two curved 
appendages on a level with the anterior margin of the lateral lobes; the whole 
structure is finely ciliated. 
The mandibles (fig. 125) with short chela; lower jaw shorter than the 
upper one, with four teeth of which the terminal and the 3rd one are large 
and of equal size, while the 2nd and 4th are very small. Upper jaw with a 
groove in the terminal tooth to receive the top of the lower terminal tooth; 
then follows a deep incision where the pilus dentarius is inserted, on a level 
with the 2nd lower tooth, then a large, chisel-shaped tooth acting against the 
3rd lower tooth; the edge behind this tooth is straight, with a row of short, 
oblique striz. 
The palps and maxille do not exhibit any characteristic features. 
The legs (figs. 126 and 127). The lengths are: 1 650 p, I] 7o0 pw, HI 720, 
IV 1210 »w. Legs I are very slender, the diameter of the tibia being only half 
that of the tibia II]. Coxa long, curved a little upwards, ventrally with two 
bristles in front of the middle, the interior one of which is very stout. Femur 
clubshaped, at the dorsal margin with two short but stout and sharply pointed 
bristles pointing inwards. Other details are to be seen on fig. 126. 
Legs II—IV stout, richely provided with bristles, especially tarsus II 
(fig. 127) which is provided with about 8 stout bristles. Tarsus IV very long. 
Loc.: Juan Fernandez, Masatierra. Among dry leaves. 16.8. 1917, 
no. 781. Numerous females. 
22. Pachylelaps hamifer n. sp. — Figs. 131—137. 
Male. 
Length 700 », width 400 w. 
Colour light brown. 
As only one specimen was found in the bags where dry leaves had been 
kept since 1917 and this naturally was rather mutilated — some legs, all the 
ambulacres, and many bristles having been brooken off — it is not possible to 
give a complete description of the species. Nevertheless enough data will be 
given to enable any one to recognize the species. 
The general shape and the shape of the dorsal and ventral shields is 
that typical for the genus. 
The sternal shield (fig. 133) has a polygonal or scaly texture except 
in the middle of the anterior half. 
Mouthparts. Epistome (fig. 136) with rounded edge with about 5 
small, sharp teeth and completely hyalin central mucro, of neatly even width 
throughout and a little more than twice as long as it is wide, in the distal 
third divided into a fringe of about 7 transparent, lanceolate teeth. 
