560 IVAK TRAGARDH 
But it is astonishing to find that JACOT in 1930 makes such an imper- 
fectly described species as VV. concentricus SAY the type of a genus, 
It is true that JACOYT has had the opportunity of examining specimens 
determined by BANKS as JV. concentricus, and has added some details to BANKs 
description. But this does not throw any light on the original JV. concentrt- 
cus SAY. 
It would seem that /Veolzodes is quite sufficiently characterized by its re- 
markable shape, the covering of the four larval and nymphal skins with their 
peculiar structure etc. Nevertheless there is one important feature which appears 
to have been completely overlooked by all previous authors. 
I refer to the peculiar shape of the hypostome and the maxille. 
In fig. 14 I give a detailed. drawing of the hypostome and maxillz of 
Neoliodes Backstromzt which shows that at the base of the maxillz there is a 
pair of transverse, narrow plates the base of which is concealed underneath 
the edge of the hypostome, and which carry two pairs of hairs and have a 
reticulated sculpture. 
Such a feature is, as far as I know, hitherto unique amongst the Oribatei 
as yet known, but occurs also in Plateremaeus vestitus from Juan Fernandez 
(compare fig. 23). 
The investigation of material of Meoliodes farinosus (C. L. KOCH) from 
Sweden has enabled me to correct some mistakes made by BERLESE (fig. 3, 
pl. 42). It is true that the anterior margin of the hypostome has a transversal 
line as drawn by B. but the hairs are inserted in front of this line, on the 
marginal shield formed by the line. In front of this B. delineates a semilunar 
transverse plate. In reality there is not one shield, but the bases of the maxillz 
are thicker and more darkcoloured so that they appear to be two shields. 
Further these basal portions of the maxilla, which are hinged on to the anterior 
edge of the hypostome, which covers their base, have two pairs of hairs, not 
one as delineated by BERLESE. These two pairs of hairs have a very charac- 
teristic shape and position; one pair, inserted near the median edge is small 
and points straight forwards, the other is large and inserted in the postero- 
lateral angle, underneath the anterior edge of the hypostome, is curved sharply 
inwards towards the middle and S-curved. 
In all these respects Plateremaeus agrees with Meoliodes as does also 
Cymberemaeus, where, however, the anterior margin of the hypostome projets 
as a free thin blade which covers half the maxille. 
3. Neoliodes Backstrémi n. sp. — Figs. 11—19. 
Length 1330 p.; width 910 ».; width of propodosoma 420 p. Length of 
shields: 410 1; 550 1; 680 p.; 800 uw. 
Colour very dark brown. 
Propodosoma (fig. 13) with a large dark coloured, hood-shaped projection 
which occupies the whole anterior part as far as to the excavations surrounding 
coxe I and extends backwards to a level with the pseudostigmata. It is through 
a narrow transversal ridge of even width throughout divided into two portions. 
