TERRESTRIAL ACARI OF THE TYNE PROVINCE 



43 



A. — Sub-family Uropodinae. 



Mouth-parts all reduced and enclosed" in a ventral cavity 

 (camerastoma) as in Oribatidffi. No unchitinised expansible 

 skin in the adult sta2:e. 



Venter grooved laterally for the legs ... ... 2 



Leg-grooves absent ... ... ... ... ... 12 



Ped. i without claws, very short ... ... .. 3 



,, with normal ambulacrum ... ... ... 5 



Dorsum without border, the setse very long ... Trichocylliba. 



Dorsal setae very short, dorsum bordered ... 4 



Annular scutum of border continuous or ... Cillibano, 



,, ,, interrupted behind ... Discopoma, 



Perigenital scutum present ... ... ... ... 6 



No perigenital scutum ... ... ... ... 7 



Pre-anal suture present ... ... ... ... Uroplitclla. 



No pre-anal suture ... ... ... ... ... Urodiscella. 



Pre-anal suture present ... ... ... ... Urobovella. 



No pre-anal suture ... ... .. ... ... 8 



Marginal scutum interrupted behind ... ... Haluropoda. 



,, of several isolated plates ... Uropolyaspis. 



,, otherwise ... ... ... 9 



Epigynal plate fringed ... ... ... ... Urotrachytes. 



,, not fringed... ... ... ... 10 



Infra-marginal lamina projecting in front... ... Trachyjiropoda. 



,, not projecting ... ... 11 



Marginal scutum as in Cillibano ... ... ... Urodinychus, 



,, ,, Dinychus ... ... ... Uropoda, 



Ped. i clawless ... ... ... ... ... Uroseiiis. 



,, normal ... ... ... ... ... Dinychus, 



10. 



CILLIBANO, von Heyden, 1828. 



Type : cassidea, Herm. 



Elliptic oblong catiila. 



Circular or sub-circular ... ... ... ... 2 



4 baciliar sette on dorsum, in a transverse row ... virgata. 



Dorsal setae all minute, hardly visible ... ... cassidea. 



Halbert records Cill. vegetans, Dugbs (from Geotnipes 

 stercorarius) — the nymph of some fimicole species 

 unknown. The name, I suppose, is taken from 

 Oudemans, who is inclined to be arbitrary in such 



