57° 



IVAR TRAGARDH 



of the proximal joint. In Plateremceus, on the other hand, the socket is found 

 at the proximal end of the distal joint, which embraces the distal end of the 

 proximal joint which is accordingly narrow. This applies to the articulation 

 between femur and genu, genu and tibia and tibia and tarsus. The femora 

 are more or less clavate, the genua very short, the tibiae long and of uniform 

 width, the tarsi short. The claws are fairly large, of uniform size and attached 

 to a slender peduncle (fig. 31). 



Loc: Juan Fernandez, Masatierra, among dry leaves, 16. 8. 1917. 



Figs. 23 — 31. PlateremcBus uestitus n. sp. 



23. Hypostome, maxillae and left palp. 24. Top of tarsus with waxy secretion. 25. Pseudo- 



stigmatic organ. 26. Slit in the dorsal shield. 27. Chela mandibuli. 28. Articulation between 



tibia and tarsus IV. 29. Articulation between femur and genu III. 30. Articulation between 



genu and tibia III. 31. Claws and peduncle. 



Cerocepheus nov. gen. 



One cannot doubt that when the acaride fauna of the tropics will be 

 better explored than it is at the present time, quite a lot of new genera will 

 be discovered and the old .system which is built up largely on european forms 

 will be greatly altered. Thanks to Jacobson's extensive collections on Java 

 and to Jeannels' collection from Africa described by Berlese as well as OuDE- 

 MAn's and v. Vitzthum's last papers we have got a fairly good idea of how 

 rich the acaride fauna of the tropics is, and what remarkable forms still await 

 their discovery. 



