1902-1903.] Fresh-Water Mites. 45 



swimming hairs, but there are a number of warty glands on 

 both dorsal and ventral surface of its body. I cannot say 

 whether this specimen is male or female. 



Fiona paucipora, Sig Thor (Plate V., fig. 4, is the male). 

 The genus Fiona was first known as Nesaea, afterwards as 

 Curvipes : it is now known as Fiona — at least, Fiersig has 

 named it so in ' Das Tierreich,' but I find it has not yet been 

 adopted by other writers. Mr Wolcott in America uses the 

 name Curvipes ; so does Sig Thor in his last paper on South 

 African Hydrachnids. The genus is fairly large, and contains 

 some very beautiful species. The fourth segment of the fourth 

 leg of the male is formed very curiously. This mite has been 

 found near Edinburgh by Mr Williamson. 



Torrenticola anomala, Koch (Flate VI., fig, 1, is the female). 

 This is the only species known in Great Britain at present. 

 This was found by Mr Taverner in Scotland. Mr Williamson 

 has a specimen from Callander. 



Frontipoda musculus, Mlill. (Flate VI. fig. 2). This is 

 another genus with a single species, but although there is 

 only one known species it is found in different colours. A 

 lateral view of three specimens is shown. Sometimes a red 

 mite is found with green legs, but it is the same species ; 

 there is no difference in structure. They are fairly common 

 everywhere. 



Thy as vigilans, Fiersig (Flate VI. fig, 3). We have several 

 representatives of this genus in Great Britain, — Thyas longi- 

 rostris, T. extendens, T. thoracatus, T. venusta, and the species 

 here figured. I have seen only one specimen of this mite. 

 I found it in a very small pond on Sunningdale Common a 

 month or so after Fiersig had found and described it. At 

 the time I found it I did not know it had been described. 

 I soon discovered I had something new. I returned to 

 that pond, intending if possible to find another; but I got 

 no more, neither then nor since. Its great feature is the 

 median eye. It is a crawling mite, not a swimmer. T. venusta 

 has been found at Bavelaw Moss by Mr Williamson. 



Neumannia vernalis, Koch, is a beautiful mite, and fairly 

 common. Mr Williamson has found it near Edinburgh. 



Laminipes ornatus, Koch (Flate VI. fig. 4). All the males 

 of this genus have a peculiar formation of the fourth segment 



