TERRESTRIAT, ACARI OF THE TVNE PROVINCE 23 



1. Crista consisting of sensillar area only ... ... Sinaris. 



Crista normal, i.e., linear with terminal expansions 2 



2. Eyes 4 ... ... ... ... ... ... ... Rhyncholophus. 



Eyes 2 ... 3 



3. Dorsum sculptured, its clothing crassate or scaly... Smaridia. 

 Dorsum plain, setas not crassate, nude or plumose 4 



4. Post-thoracic furrow absent... ... ... ... Achorolophns, 



Post-thoracic furrow present... ... ... ... 5 



5. Dorsal trichomes opaque, dark coloured ... ... Ritteria. 



Dorsal trichomes trunslucent ... ... ... Belaustium. 



SMARIDIA, Dugbs, 1834. 



Dorsum strongly shouldered, its surface variously 

 sculptured ; trichomes more or less clavate or 

 squamose Rostrum prominent, very long when 

 fully extended. 



Type : papulosa^ Herm. 



24. Smaridia ampulligera, Berl. 



Dorsal trichomes not pectinate or plumose. 



Yorkshire, Scotland. 



SMARIS, Latr., 1807. 



Like Smaridia but much larger, and the sensillar area 

 only of the crista is present (often taken for a pair 

 of median eyes !). Rostrum inferior, normally 

 hardly visible from above. Dorsal trichomes 

 spine-like. 



Type : expaipis, Herm. 



25. Smaris expaipis, Herm. 66, 67, 68. 



Quite common, and partial to watery places and 

 sphagnum. Ascends over 2,000 feet on Cheviot. 

 The dorsal trichomes are narrowly lanceolate, 

 elbowed at the base, each springing from the 

 centre of a hexagonal space. 



RHYNCHOLOPHUS, Dugfes, 1834. 



Eyes four. Body not rounded behind, but truncate 

 or slightly angular. Dorsal trichomes rodlike, 



