6oo ivAR tragArdh 



and surrounded by a larger, funnel-shaped structure which penetrates obliquely 

 inwards and backwards and is twice as deep as the pseudostigmata. Between 

 the inner ends of these funnels there is a faint transversal line, which un- 

 doubtly indicates the real dividing line between propodosoma and hysterosoma. 

 If this interpretation be true, it would mean that the hysterosoma sends out a 

 collar-shape fold, which embraces the base of the propodosoma and is almost 

 completely fused with it, 



Areae porosae. The area porosa adalaris (fig. loo) is big and curved 

 somewhat like a boomerang. The surface is finely transversally striated and 

 there seems to be a median slit in it. There are two pairs of oval areae 

 porosae mesonoticae, with fine striae running towards the periphery from a 

 central pore. The areae posteriores are of the same shape as the a. p. adalares 

 but only half as big and striated transversally (fig. 99). 



The legs. Tibia I distally and dorsally with a conical projection, carry- 

 ing a long bristle bent forwards (fig. 95); tarsus I behind the middle dorsally 

 with 3 slender tactile hairs. 



Femur II (fig. 97) ventrally with a large triangular blade almost as broad 

 as the femur; its greatest width is between the anterior and median ^Iz of 

 length and it carries a long submarginal hair at the top of the projecting edge. 



The claws are very heterodactyle, the median one being rather stout, 

 while the others are slender, 



Loc: Juan Fernandez, Masatierra, among dry leaves. 



17. Galumna pacifica n. sp. — Fig. loi — 108. 



Owing to the investigations of Berlese (1914), Oudemans (1919) and 

 Jacot (1029) we have a fairly good knowledge and survey of the species 

 of the subfamily Galumninae so far described. The present species offers, there- 

 fore, far less difficulties of identification than many other American Oribatei. 



It belongs to the groups »integrae curtipilae» established by Berlese 

 (1914) characterized by the complete fusion of the propodosoma and hystero- 

 soma on the dorsal side and by the very short not to say inconspicuous inter- 

 lamellar hairs. It is easily recognized from the few species of this group by 

 the number, shape and position of the areae porosae. 



Average length 720 {i; width 570 {jl; height 540 [J-. 



Colour chestnut-brown, opale yellowish-brown on the dorsal side of the 

 propodosoma, ventral side dark brown. 



Texture very difficult to see, owing to the globular shape and hard 

 cuticle of the species, which makes it very difficult to dissect or to study in 

 transmitted light. On specimens treated with boiling lactic acid it is, however, 

 easy to discern a kind of scaly texture on both sides of the propodosome-hys- 

 terosomatic suture, because here the cuticle is more light-coloured and it may 

 be that the rest of the cuticle has the same texture. On the upper side of 

 the pteromorphae the cuticle is covered by very minute granules, and the same 

 applies to the sides of the body above the coxae. 



