40 BRITISH TYROGLYPH1IXE. 



appears also that an importance is attached to the 

 suckers greater than what I should consider the classifi- 

 catory value of those organs ; and that the distinguish- 

 ing of Grlycypliagus by the rudimentary claw is hardly 

 satisfactory, because it is a question of degree, and the 

 claw in Glyeyphagus, although very small, is usually 

 distinct, and it is very small also in some species of 

 Tyroglyphus. I do not quite like the distinction of 

 long and short tarsi as partly differentiating Tyrogly- 

 plius from Rhizoglyphus ; it seems to me that the tarsi 

 of R. echinopus are as long as those of T. ovatus. 



Professor Antonio Berlese in 1897 published 

 his c Ordo Cryptostigmata ' (part I, published after 

 part II). This is the introductory and classificatory 

 portion, as to the Sarcoptida3 and Tyroglyphidse, of 

 his great work on the Italian Acari.* It contains 

 (pp. 99 101) a classification of the Tyroglyphidse, 

 which is certainly one of the most elaborate and care- 

 ful yet issued, and contains the recently added genera 

 up to date. The following is a translation : 



SUB-FAMILIES OF THE TYROGLYPHID^. 

 This family may be divided into sub-families thus : 



Ambulacra borne on lengthy peduncles . LENTUNGULINA. 



'Ambulacrum consist-"\ 



Ambulacra 



Conspicuous 



copulatory 



discs present 



in the males. 



and a minute median 

 sesslle ' claw. 



ing of a large claw and I TYBOGLYPHINA . 

 an almost obsolete I 

 membrane. J 



Ambulacrum a broads 

 triangular membrane 1 CHOBTOGLYPHINA . 



(Mandibles chelateA 

 chela short, arms IGLYCYPHAGINA. 

 tory aiscs -\ thereof subequal. 



in the males. Mandibles terminating ] HlBTIOSTOMINA . 

 I in a saw ; not chelate. ) 



Histiostomina. 



Contains only the genus . . . Histiostoma. 



* 'Acari Miriapoda ft Srorpiones hujusque in Italia Reperta,' 

 Fierenze and Portioi, 18821898, still publishing. 



