572 IVAR TRAGARDH 
Mouth-parts. Mandibles (fig. 37) of a very peculiar not to say unique 
shape, not hitherto met with amongst the Oribatei. They are exceedingly long 
and narrow, tapering gradually towards the end, with small chelz which seem 
to be edentate. It seems evident, that they can be protruded and retracted 
through the incision at the top of the rostrum. 
The palpi (fig. 41) are 5-jointed, with very short, triangular Ist joint, 2nd 
joint almost twice as long as it is high, of almost uniform width, with two 
ventral tactile hairs; 3rd joint smail, with one dorsal hair near posterior end, 
curving downwards and s-shaped, 4th joint of even width, slightly longer than 
it is high, with one long marginal hair dorsally in the middle, one shorter ex- 
Cae 
ny 
J Gurtle 
© 
Figs. 32-33. Cerocepheus mirabilis nov. gen, n. sp. 
32. Dorsal'view. 33. Ventral view. 

teriorly on the same level and one curved hair ventrally near the anterior end; 
5th joint slightly shorter than the 2nd, a little more than twice as long as it 
is high at the base, tapering gradually towards the end which is cut off 
obliquely from the ventral side and bent slightly upwards. It carries the usual 
stout bristles in the distal half, known from so many Oribatei and presumably 
used as a kind of fork when eating, but they are longer than is usually the 
case and all placed near the end. Besides these there are 5 tactile hairs placed 
as fig. 41 shows. 
Hypostome (fig. 36) elongated, with very long, lanceolate maxille. 
Ventral side (fig: 33). Genital aperture very small, oval, with 4 pairs of 
small hairs. Anal aperture about twice as wide and long as the genital aper- 
ture and almost quadrangular, removed from the posterior margin as far as 
half its width, with two pairs of hairs near the lateral margin. 
