ACARINA FROM THE JUAN FERNANDEZ ISLANDS 557 



rical projections. On the inner (median) side of these there is a pair of very 

 short and inconspicuous interlamellar hairs. 



In front of the lamellar hair the texture of the rostrum is quite different, 

 exactly as in P. peltifer. There are no larger deep pores, but the punctures 

 remain. 



The pseudo stigmatic organs (fig. 9) are short, the stalk is attached to the 

 bottom of the narrow funnel which is directed obliquely outwards and back- 

 wards, so that it is bent forwards in an acute angle. The head is rod-like 

 with slightly rough surface and a little shorter than the extrastigmatic part of 

 the stalk. 



The dorsal side of the hysterosoma has a median portion which is 

 slightly convex and by a narrow, depressed area set off from the marginal 

 shield which surrounds its sides and the posterior end and is narrowest an- 

 teriorly and widens slightly towards the middle, being further back of almost 

 uniform width throughout. The central portion is well rounded posteriorly as 

 is also the marginal shield. 



The margin of the marginal shield is slightly serrated as is also the de- 

 marcation line between the central and marginal shields. 



On the hysterosoma we notice the following hairs, all small, pointed and 

 slightly curved. At the lateral margin there are 5 pairs of hairs almost 

 equidistant, only the 2nd and 3rd being a little further apart than the rest, 

 the posterior pair is inserted exactly at the point where the lateral and posterior 

 margin meet. The posterior margin has only one pair of hairs, slightly longer 

 than the others, set very closely in the middle and crossing one another. On 

 the central shield there are two rows of small hairs placed as fig. 7 shows. 



The ventral side does not exhibit any characteristic features. 



The legs have well developed tarsi (fig. 10), richly provided with hairs 

 and have dorsally near the top about 3 somewhat longer tactile hairs. 



The ambulacres are tridactylous, the median claw being a little stouter 

 than the other two (fig. 10). 



Loc: Juan Fernandez, Masatierra, among mosses and leaves. Numerous 

 specimens. 



Nympha. 



Length 810 \^. Width 450 {i. 



Colour of hysterosoma dirty white, of propodosoma, epimera and legs 

 chestnut brown. 



Propodosoma with the same sculpture as the fullgrown, viz. extremely 

 finely but distinctly punctured and besides this with circular, light coloured 

 depressed areas, except in front of the lamellar hairs where there are only 

 punctures. 



Interlamellar hairs small and slender, lamellar hairs inserted on top of 

 conical projections at the top of the lamella where they are joined together 

 by a distinct low ridge. 



The pseudostigmatic organs are not developed but in their place there 

 is a small, transversally striated plate near the anterior angle of which there is 

 a small hair. 



36 — 29232. The Nat. Hist, of Juan Fernandez and Easter Isl. Vol. III. 



