382 REV. J. E. HULL ON 



collections made by Mr. Bagnall at Grange-over-Sands. With 

 regard to Yorkshire I have not been quite so fortunate, though 

 several correspondents have favoured me with a few specimens 

 from time to time. 



For many years Dr. Berlese, the Italian acarologist, has 

 been the leading authority on Oribatidae. His knowledge of 

 the family is quite unrivalled, and I have felt constrained to 

 follow his classification and nomenclature as far as I con- 

 scientiously could. A vast increase in the number of species, 

 European and otherwise, has caused him to establish many 

 new genera ; but he has not recently published any complete 

 systematic list, so that I have found it necessary to propose a 

 few new genera to preserve the balance of groups. Moreover 

 to equalise values as far as possible I have raised some of his 

 subgenera to the rank of genera. In fact I have eschewed 

 subgenera altogether, as I see no practical advantage in them, 

 and have no liking for a cumbrous multinomial nomenclature. 



I have incorporated in this list an analytical key of genera 

 and species for two reasons — first, because it seems well to 

 make it as clear as possible in what sense each name is used ; 

 and secondly, because it may thus serve as a preliminary 

 guide to the study of the family. 



A. — Sub-family Tegeocraninee. 

 Legs ii., in., iv. inserted under the body so that the lateral 

 margins of the sternal plates are approximately parallel. 



1. Dorsum smooth (if pitted, the pitting very minute) ... 2 

 Dorsum rough (granulate, furrowed, ridged, or deeply 



pitted) 4 



2. Mandibles styliform, serrate 

 Mandibles normal .. 



3. Usual sensory seta on tibia i. 

 No sensory seta on tibia i. 



4. Claws tridactyle ... 

 Claws monodactyle 



5. Dorsum marginate 

 Dorsum without any diverse margin .. 



6. Front margin of dorsum much modified 

 Front margin of dorsum normal 



Serrariics. 



3 

 Liacarus. 



Phvllotegens. 



5 

 8 

 . Ommatocepheus. 

 6 



Scutovertex. 

 7 



