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, wiih 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. 



■Fig. 157. Urobovella bicarinata n. sp. Maxillary palp cf. 



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); 1st 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 Nal. Hist, of Juan Fernandez and Easier Isl. Vol. III. 



