TERRESTRIAL ACARI OF THR TYNE PROVINCE 19 



§i. Microfhrombidium, s. str. Type : pusillum, Herm. 



Dorsal pubescence of thickened opaque trichomes. 

 Eyes obliquely raised on a much abbreviated 

 peduncle. Tarsus i broadly ovate. Lateral spine 

 of palp usually solitary and very strong. 



§ii. Type : sucidum, L. K. 



Dorsal pubescence of true translucent spines 

 uniformly tapering to a fine point, feathered with 

 long fine hairs. Eyes less oblique, more nearly 

 sessile, and further apart than in §i. Tarsus i 

 oblong or only slightly clavate. 



§i. 



1. Dorsal trichomes mingled with some feathered spines ... planatm. 

 Dorsal trichomes all similar ... ... ... ... 2 



2. Dorsal trichomes slender, rather long, almost cylindrical pusilhtm. 

 Dorsal trichomes shortly fusiform, densely hairy ... simiilans, 



ID. Microthrombldium pusillum, Herm. 67. 



Ottonia valga, Geo. 



Trombiditim fiarvum, Geo. 



The examples recorded under this name are all 

 northern (Germany northwards). The species 

 may therefore be different from Hermann's 

 pusillum, in which case its name will be puniceum, 

 Koch. I do not find any specific difference 

 between the British specimens I have seen and 

 the pusillum of Thor and Oudemans. In West 

 Allendale I find it in sphagnum and have never 

 seen it below 1,000 feet. 



Yorkshire, Ireland, Scotland. 



II. Microthrombldium plancum, K. 67. 



M. geographicum, Berl. 



West Allendale, in moss, 19 13. I have never seen 

 it since. 



