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 chelje 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 small, 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- 



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 maxillae. 



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. 



