ACARI 549 



that the nympha of G. armatus has the saine mode of life, 

 altliough it was on tins occasion found free. 



There is ail the more reason to présume that it dérives its 

 means of subsistence from some beetles (or other insects), 

 as it is the form most liberally provided with adhering-organs. 

 As such the above mentioned bristles must be interpreted ; 

 that is évident from a comparison with other acari which hâve 

 a similar mode of life, as for instance Pterygosoma Peters. 



It is in this connection of interest to note that in the species 

 G. armatus, which is best provided with adhesion-organs, 

 the mandibles are most degenerated, exactly corresponding 

 to the retrogressive development which takes place in syni- 

 phylous acari, viz. the disappearance of the teeth, and the 

 transformation of the chela into lambent organs. 



If the suggestions made above are true, it follows that 

 the nympha of G. armatus cannot be considered caverniculous 

 any more than the parasites of the bats, for instance. Wether 

 this applics to the adult or not is impossible to say. 



EURYPARASITUS Oudms. 

 E. terribilis (Mich.) 



(Fig. 45-60). 



Département de Corse {France). — Grotte de Pietralbello, 

 commune de Ponte-Leccia, canton de Morosaglia, 9th Ja- 

 nuary 1907 ; N^ 187, 5 o', 10 nymphae. 



Distribution : England, Netherlands. 



E. terribilis was discovered, in 1886, by MiCHAEL,in a mole's 

 nest. M. carefully described the maie and female, and was 

 able to make some highly important observations of its mode 

 of feeding, copulation, etc. 



His description of the ventral surface was not detailed enough 

 to prevent Berlese from misinterpreting it, a fact which was 

 also brought about by M's figure, which is not quite accurate. 



