THREE RARE SPECIES OF HYDRACARINA 



63 



had a smooth-skinned species quite distinct from kvigata. 

 following are the more striking points of difference : 



The 



H. kvigata. 



Capitulum rather compressed, with 

 its anterior end somewhat 

 flattened. 



Between capitulum and rostrum a 

 deep lateral constriction. 



Rostrum very slightly bent. 



Mandible with a small spur arising 

 from its bulbous proximal end. 



Palpi with a strong ridge or infolding 

 of skin, extending from inner 

 proximal end of first segment 

 towards distal outer end of second 

 segment. 



H. levis. 



Capitulum stout, tapering 

 from its base upwards. 



Lateral constriction wanting. 



Rostrum straight, inclined 



well downwards. 

 Spur wanting. 



Surface of palpi without any 

 ridge or infolding. 



Hydrarachna levis <j> , rostrum, palpi, and mandibles. 



From the fact that the skin is devoid of papillae, although it 

 exhibits one or two patches of a scale-like nature, I propose the 

 name Hydrarachna levis, mihi, with the following description : 



Body. Length about 5 mm. Colour bright red with a paler dorsal 

 patch. 



Skin smooth, exhibiting, but only under a considerable magnifica- 

 tion, a fine scale-like surface in the area enclosed by the first 

 three pairs of epimera and the genital shield, and patches of a 

 similar nature near the eyes. 



Antero-dorsal plate wanting. On the inner side of each eye 

 capsule, an elliptical porous ring. At a distance behind each 

 eye capsule, equal to about one and a quarter times the 



