LINCOLNSHIRE FRESHWATER MITES. 



C. F. GEORGE. M.R.C.S., 



K t fton-in-T.indsey , fJncobishii-i 



Arrhenurus nonforpicatus n.sp. This mite is of a brick- 

 red colour, and is in external anatomy very much like Aj'r/iennrus 

 forpicatiis Newman. It has the same thick hair-pad on the inner 

 side of the second joint of the palpus ; the petiole is also niuch 



the same, but it does not possess 

 the forceps-like formation at the 

 end of the tail so characteristic 

 oi A. forpicatiis. A g-lance at the 

 figures of the two mites will show 

 clearly what I mean. A. forpicatiis 

 is a fairly common mite, but I have 

 only met with ono. specimen of the 



Arrhenurus nonforpicatus n.sp. 



Upper figure, Dorsal surface. 

 Lower figure, Tail much magnified. 



Arrhenurus forpicatus Newman. 



mite I am describing", so that it 

 must be pretty rare. Mr. Soar 

 kindly drew the figures from my 

 specimen. I may say that we 

 have two varieties of forpicatiis, 

 both fairly common, one a dark 

 green colour, the other red, but 

 not the same kind of red as nonforpicatus. However, colour, 

 thoug-h useful, is not always to be relied on ; not only does it 

 differ in the same mite at different periods of its life cycle, but 

 mites anatomically alike, differ in colour, in different districts. 

 Such is especially the case with regard to Diplodontiis, which is 

 usually of a bright scarlet, but in some localities it is of a dirty 

 yellow. 



Naturalist, 



