ON SOME NEW AND RARE BRITISH ARACHNIDA. 89 



Abdomen blackish or deep black-brown, very thinly clothed 

 with hairs ; spinners dull yellowish ; genital aperture and 

 process prominent, and of very characteristic form. 



This species was received from Mr. W. Falconer from 

 Huddersfield and Hexham in 1902 and 1903, and appears to 

 be a very distinct one of the M. viaria group. 



Mieroneta passiva, sp. n. Figs. 22-26. 



Adult male, length i line. 



This is also of the M. viaria group, but rather smaller than 

 that species. 



The cephalothorax is very broad, almost round behind and 

 tapering quickly to an obtuse, but rather truncate termination in 

 front ; the lateral marginal impressions at the caput are obsolete, 

 and the profile line has a considerable dip or impression between 

 the occiput and the beginning of the hinder slope. The colour 

 of the cephalothorax is rather orange yellow-brown, marked 

 with blackish brown, on the sides, margins, and on the caput 

 behind the eyes. The height of the clypeus is nearly two-thirds 

 of that of the facial space. 



The general position of the eyes is normal ; the interval 

 between those of the hind-central pair is rather less than that 

 between each and the hind-lateral eye next to it. 



Legs moderate in length and strength, 4, i, 2, 3, of a bright 

 orange-yellow ; the tibiae and metatarsi, especially of the first 

 two pairs, suffused with blackish brown. 



Palpi rather strong ; cubital and radial joints short, the former 

 strongest, and has the two characteristic slender bristles towards 

 its fore extremity on the upper side directed forwards, the 

 posterior (or shortest) bristle being slightly more than half the 

 length of the longer one. The digital joint is large and the 

 palpal organs highly developed. At about the middle, near the 

 outer side, the digital joint is strongly and angularly protuberant. 

 The palpal organs are very prominent, but their structure, 

 although the different parts differ in form from others nearly 

 allied, can only be satisfactorily given by magnified drawings. 



