ACARINA FROM THE JUAN FERNANDEZ ISLANDS 621 
wavy, running on the posterior slope of the mesopleuric ridge which they fol- 
low to the top, where they bend sharply inwards and run along its anterior 
side halfway inwards. 
The legs (figs. 150, 152). All the legs have narrow blades along the 
ventral edge of the femora; the edge of these blades is finely dentate. 
Legs I (fig. 150) with large conical coxa, on the dorsal lateral side of 
which there is a thin blade the edge of which is finely serrated in the anterior 
half. Ventral side with two longitudinal, short ridges. 
Trochanter triangular, with a short marginal, triangular blade. Femur with 
distinct basifemur; behind the dentate edge there is a small knob, with a per- 
pendicular pointed bristle. Tarsus long, cylindrical, fully 4 times as long as it 
is wide, with numerous tactile hairs dorsally in the distal half, one of which is 
as long as the tarsus; claws small, on a fairly long peduncle. 
We, : PLL = 
\ =— 
\ ——— 
‘ - Tis a 
¢ zm 
wa 
Fig. 157. Urobovella bicarinata n. sp. Maxillary palp o, 
Legs II—IV (fig. 157) with similar, but larger blades on femora; tarsi 
tapering, with 2—3 stout bristles at the top. 
Mouthparts, The epistome and the hypostome I have not been able to 
see plainly. Mandibles (fig. 154) very long and narrow. Chela of a very pe- 
culiar shape. Lower jaw slender, of almost even width, with short terminal 
tooth and one tooth a little in front of the middle. Upper jaw more than 
twice as wide as the lower jaw, tapering gradually towards the narrow terminal 
tooth, cutting edge with three low teeth of uniform size, occupying the whole 
edge. Upper jaw with a most remarkable appendage, a thin lamella of even 
width in the basal half, then constricted and finally bent backwards and wid- 
ened to a spoon-shaped structure, the edge of which is finely fringed. 
Palps (fig. 157); Ist joint very short and high, with two very long, finely 
hairy bristles on a low projection at the ventral edge, 3rd joint ventrally with 
strong, bipectinate bristle; terminal joint conical, pointed, with numerous tactile 
hairs, of which one ventral near the base is much longer than the others. 
Female. 
Size, colour and general shape the same as in the male, only the female 
is a little broader. 
40—29232. The Nat. Hist. of Juan Fernandez and Easter Isl. Vol. Ill. 
