602 IVAR TRAGARDH 
of the lamella. The pseudostigmatic organs are fairly long, curved obliquely 
upwards and backwards at an almost right angle. The peduncle is very thin, 
the head very slightly thickened, spindle-shaped, about half as long as the 
peduncle, pointed and with rough surface. 
Mouthparts. OUDEMANS is, as far as I know, the first one who has 
called attention to the peculiar shape of the hypostome, which is to be found 
in some of the Galumninze (1919, p. 36). In most of the Oribatei the floor 
of the camerostomum is formed by a large plate, the so-called hypostome, to 
which the maxille are joined. Sometimes, as in the Phthiracarinz, the hypo- 
stome is rather small, the greater part of the floor being formed by the max- 

106 
Figs. 104—108. Galumna pacifica n. sp. 
104. Left half of propodosoma. 105. Pseudostigmatic organ. 106. Hypostoma. 17. Palp. 
108. Area porosa mesonotica. 
illaz. In the Galumninz, as OUDEMANS has pointed out, in some species the 
hypostome has developed to such an extent, that it occupies the whole space, 
the maxilla having as a consequence been pushed forwards so that they are 
inserted on the dorsal side of the hypostome. This is the case in G. 
pacifica, where they are barely seen along the edges of the hypostome 
(fig. 106). 
Palps (fig. 107) with very short basal joint, the 2nd joint is very large 
and flattened from both sides, its length being equal to twice its width (on 
lateral view); along the ventral margin there is a narrow, thin, browncoloured 
blade running forwards as far as to the ventral bristle, which is straight and 
points downwards; in front of it there is another narrower blade; on the ex- 
ternal side almost in the middle of the joint there is another hair, curved in 
an even curve forwards and upwards. 
