ON NEW AND RARE BRITISH ARACHNIDA. 6 1 



and in a transverse line near its base are two more or less 

 conspicuous dusky blackish round spots. 



Adults of both sexes of this very distinct spider were sent to 

 me from Hexham by Dr. A. R. Jackson in January, 1904, 

 females having been before received from Mr. W. Falconer, 

 Huddersfield (July 8th, 1903). 



Tmeticus rivalis, sp. n. Pi. A, Figs. 14, 15, 16, 17, 18. 



Adult male, length rather less than i line ; adult female, 

 i line. 



The cephalothorax is yellow-brown, short, broad, about equal 

 in length and breadth, or slightly longer than broad, well 

 rounded in front ; lateral marginal impressions scarcely 

 perceptible, upper convexity uniform. Height of clypeus half 

 that of the facial space. 



Eyes sub-equal and of tolerable size, rather closely grouped, 

 and occupying nearly the whole width of the fore part of the 

 caput. The hinder row has its very slight curve directed 

 backwards, that of the front row forward. The hind-centrals 

 are about a diameter's interval apart, but rather further from 

 each other than from the hind-laterals. Those of the anterior 

 row are almost contiguous to each other. The fore-central eyes 

 are a little the smallest. The four centrals form a square, whose 

 fore-side is shortest. 



The legs were much damaged, but appeared to be moderately 

 long; their relative length, 4, i, 2, 3, of a pale yellow-brown 

 colour, and furnished with hairs. 



Palpi rather short ; the radial is stronger than the cubital 

 joint, its fore extremity very slightly produced, and beneath the 

 fore-margin are two small projecting points, giving it a some- 

 what emarginate appearance, the point on the inner side being 

 the strongest, and behind the joint are several strong bristly 

 hairs. The digital joint is large, obtuse-oval, with a large lobe 

 on its outer side, and the palpal organs are well developed 

 and complex. There is a strong curved C-shaped process 



