ON NEW AND RARE BRITISH ARACHNIDA. 141 



Palpi similar in colour to the legs ; cubital and radial joints 

 short and of equal length ; the former has a tapering black 

 bristle from near its fore extremity on the upper side, digital 

 joint, rather large, with a largish lobe towards its extremity on 

 the outer side. Palpal organs highly developed, complex, with 

 the normal crescent-shaped process (or paracymbium) at their 

 base on the outer side large and of characteristic structure. 



Sternum oval, with the hinder extremity drawn out into a 

 longish tapering, obtuse termination between the coxae of the 

 fourth pair of legs. 



Abdomen oval, sooty-brown, hairs short, slender, and scanty. 



The female resembles the male in general characters and 

 colours. The sternum, however, differs in having its hinder 

 extremity drawn out very slightly and its termination broad and 

 truncated. The genital aperture has a very characteristic pro- 

 cess issuing from its fore extremity and directed backwards in 

 close contact with the surface of the abdomen. It is long, 

 slender, slightly tapering, and its point reaches rather beyond 

 the middle of the abdomen, bearing considerable resemblance 

 to that of Sintula diluta, Cambr. 



Adults of both sexes were found in Delamere Forest by Dr. 

 A. R. Jackson and Mr. W. Falconer. 



Tmeticus nigrieauda, sp. n. Pi. A., Figs. 32, 33, and 

 PL B., Figs. 34-41. 



Adult male, length, i lines. Female, i J ditto. 



Cephalothorax of normal form ; the lateral marginal im- 

 pressions at caput very slight. Colour yellow-brown, the caput 

 and normal grooves and indentations marked with dark brown. 

 The height of the clypeus equals half that of the facial space. 

 Eyes small in two transverse, slightly-curved rows, the front row 

 shortest. The convexity of the hinder row strongest and 

 directed backwards, that of the front row forwards. The 

 interval between those of the central pair of the hinder row 

 slightly less than that between each and the hind-lateral next to 



