ACARINA FROM THE JUAN FERNANDEZ ISLANDS 587 



concealed in the acetabula; femur I and II clubshaped, with thin proximal 

 peduncle, and ventrally and distally a thin short triangular blade; femur II 

 ventrally with a sharp tooth exactly where the joint widens. Femur I with 

 two ventral hairs curved forwards in the proximal half, one straight external 

 hair and two dorsal hairs near the middle, P'emur II with the same number 

 and position of the hairs. 



Trochanter III and IV large, curved outwards and downwards. Femiir 

 III and IV long and slender, only slightly clavate with distal blades ventrally 

 as in femora I and II, and with one ventral hair behind the middle and one 

 dorsal hair near the distal end in femur III and one a little in front of the 

 middle in femur IV. 



Genu I — IV very small, not longer than they are wide, each with 2 — 3 

 long tactile hairs. 



Tibia I — II long, with very slender proximal half widening towards the 

 end, where there is one dorsal projection carrying a very long tactile hair. 

 Tibia III — IV still longer and more slender, less swollen at the end and slightly 

 curved like an S. Tibiae I and II with about 6 long tactile hairs in the distal 

 third, tibiae ni and IV with 3—4 similar hairs. 



Tarsi I— IV short, with bases as wide as the top of the tibiae and 

 apparently only little articulated against them, tapering towards the end and 

 provided with 10 — 12 long tactile hairs. Claws monodactyle, large and strongly 

 curved. Tarsi III and IV with 3 stout spines, two flanking the base of the 

 claw and one smaller dorsal one. 



Loc: Juan Fernandez, Masatierra. Among dry leaves. 9. 8. 191 7, 

 no. 755. 



JO. Odontocepheus sexdentatus n. sp. — Fig. 62. 



Amongst dry leaves collected in small bags for the purpose of investig- 

 ating the molluscs and afterwards kept at the Museum of Natural History of 

 Stockholm a species of this genus v.'as found. Its legs were broken off but in 

 other respects it was well preserved and, moreover, so characteristic, that it 

 can be described. 



Length 890 |j.; width of hysterosoma 420 {i; length of propodosoma 600 [i; 

 width of propodosoma 280 ji. , 



Colour light brown. 



Texture finely punctured. 



Propodosoma (fig. 62) of the same general shape as in O. longipilus 

 (compare fig. 60). The lamellae are very low, narrow bands of slightly darker 

 chitin, of even width throughout and diverging sHghtly in the proximal % and 

 then slightly converging. In front of them the cuticle has numerous transversal 

 winkles connecting the tops of the lamellae exactly as in O. longipilus. The 

 lamellar and rostral hairs are placed as in 0. longipilus and of the same shape 

 but the rostral hairs are twice as big as the lamellar hairs. Lamellar hairs 

 straight, inserted on a level with the pseudostigmata, close to the inner margin 

 of the lamellae. 



