Georort^ : Lincolnshire Frcskivater Mifes. 151 



ihe most important difference is to be found in the gfenital plates, 

 which are long- and gradually become almost pointed, nearly 

 embracing^ the under part of the abdomen in obiofigus, whilst in 

 lonoriusculus they are long- oval, with the outer end rounded, 

 and the inner, where it meets the g^enital orifice, is truncated, as 

 in Fig:. -• The epimera and leg^s are a fine transparent blue, 

 there are also patches of blue on the shoulders, and at the 

 posterior end of the dorsum, the rest of the dorsal skin, though 

 chitinous. is somewhat transparent, and tiie contents of the body 

 show through it, g^iving- it a mixed colour of red, brown, and 



Arrheaurus longiusculus n.sp. 



yellow, of no distinct pattern. There is a well-marked spur or 

 process on the fourth joint of the last leg. and the palpi are 

 somewhat remarkable, see Fig. 4. The length of the mite is 

 o-QD mm. I found it in Aug-ust. 1003, in the Scawby fish pond. 



Fig. I is the upper surface of the mite. 



Fig. 2. under surface. 



Fig. 3. side view. 



Fig. 4, under surface of palp. 



Legs not figured. The eyes are bright crimson. 



1904 May I. 



