386 British Hydrachnidce : The Genus Fiona. [Sess. 



or so nicely curved as in the case of P. nodata, Miill. Distal 

 end of patella with only five long swimming-hairs. (Plate 

 XLIL, figs. 85-90.) 



Localities. — Norfolk Broads. Eare. 



19. Fiona 'pauci'pora, Sig Thor. 



Female. — About 1*20 mm. in length. Colour very pale 

 and transparent, with very faint markings on dorsal surface. 

 Chitinous parts colourless. Genital plates sickle - shaped, 

 with about 10 acetabula on each plate, and some free on the 

 ventral surface. 



Male. — About 0*96 mm. in length. It can easily be 

 identified from Piona males at present known in Britain by 

 the wide space between the epimera, the third and fourth 

 pair being as wide apart as in the females. (Plate XLIIL, 

 figs. 91-97.) 



20, Fiona uncata, Koen. 



Female. — About 1*80 mm. in length. Colour yellow with 

 brown markings, Malpighian vessel in some cases red or 

 light yellow. All chitinous parts blue - grey. Legs well 

 supplied with swimming - hairs. Most prominent feature 

 is the number of hair pegs on the flexor edge of fourth 

 segment of palpus (see fig. 100). Palpi thicker than 

 trochanters of first pair of legs. Genital plates disc-shaped, 

 with from 15 to 25 acetabula each, two on each plate being 

 larger than the others. In Koenike's figure of the female 

 there are several small hair pores between the genital plate 

 and the front part of the genital aperture, but in the specimen 

 from which my drawing was made there are only two on 

 each side. 



Male. — About 1*20 mm. in length; similar in colour to 

 female. Short, thick, blunt-looking claws to tarsi of third 

 pair of legs. Five hairs to distal end of patella. Genital 

 area with the usual plates, and trefoil-shaped seminal pocket ; 

 each plate with from 20 to 24 acetabula. (Plate XLIV., 

 figs. 98-104.) 



Localities. — Not common. 



