TERRESTRIAL ACARI OF THE TYNE PROVINCE 4I 



83. Bdella pallipes, L. Koch. 66, 67, 68. 



Originally described from the Arctic. It seems to be 

 as general as the preceding, but never so gregari- 

 ously plentiful. Easily recognised by the equal 

 length of the third and fourth joints of the palp. 



Westmoreland, Yorkshire, Lancashire (Southport, 

 Dr. Chaster). Lincolnshire (Dr. George — three 

 specimens, now in the Hull Museum). 



III.— GAMASID/E. 



The chief existing British records are due to Michael 

 (various papers), Halbert (Clare Island Survey — 71 species). 

 Hirst (parasites), and Donisthorpe (myrmecophiles). These 

 in the aggregate make a good solid total which I have been 

 able to increase by some 50 per cent, or thereabouts, very 

 largely by means of material sent by the same correspondents 

 who so liberally supplied me with other Acari. I have had 

 the further advantage that my own collecting has been chiefly 

 confined to an upland area (ranging from 700 feet to 2,200 

 feet above sea-level) while my correspondents have ransacked 

 the plains and coast regions. But my geographical position 

 has the very serious disadvantage that the indispensable 

 books of reference and microscopical appliances do not abound 

 in this recess of the Pennines. I am therefore deeply indebted 

 to those who have lent me books, &c., and others who have 

 verified references for me, and have made extracts and 

 tracings from works not accessible to me. 



In 1916 Dr. Berlese of Florence described over 100 new 

 Gamasids. While new material is coming in at this rate it is 

 fairly obvious that the limits of genera cannot be in a very 

 fixed state. 



For convenience of arrangement, I divide the family into 

 two main sections — the Barypoda, short-legged and slow- 



