1883.] REV. O. p. CAMBRIDGE ON NEW SPIDERS. 36.5 



Palpi leg-like in the female, armed as the legs and ending with a 

 single curved claw. 



Falces strong, prominent and massive, considerably gibbous at the 

 base on the upperside, the gibbosity greatly prolonged forwards in 

 a curved form in the male. 



Maxill(B short, broad, convex in front and prominent in an obtusely 

 conical form at the base, with only a slight subconical prominence 

 at the extremity on the inner side. 



Labium short, somewhat subtriangular, its apex rounded, and its 

 base inserted into a deep rounded indentation of the sternum, which 

 is oval, with a round impressed spot on the margin opposite to the 

 insertion of the basal joints of the first three pairs of legs. 



Abdomen short, oval ; very convex above, with a bare, subtrian- 

 gular, or somewhat kidney-shaped patch on the upperside near the 

 fore extremity. Spinners 6 ; an interior transverse row of four, of 

 which the outer ones are very small ; the superior pair long, upturned, 

 and three-jointed. 



Atypoides RiVERSii, sp. u. (Plate XXXVI. fig. 2.) 



Adult male, length 6 lines. 



Cephalothorax greenish brown ; caput dark and of a reddish- 

 brown tinge, marked on its surface with minute punctures. 



Legs similar in colour to the thcrax, those of the two foremost 

 pairs being darkest ; the terminal tarsal claws are three, the superior 

 pair long and pectinated, the mferior claw small. 



Falces darker than the caput ; they have an extraordinary appear- 

 ance from the two long, projecting-, curved apojjhyses at their base ; 

 these are cylindrical, obtusely pointed, and densely clothed at and 

 near their extremity, above and on the sides, with long coarse bristly 

 black hairs; the extremity of the falces in this sex (J) have no 

 spines on the upperside. 



Maxilla; similar in colour to the caput. 



Palpi long, strong, similar to the fore legs in colour ; the radial 

 joint is double the length of the cubital, of an elongate-oval or tumid 

 form, clothed underneath with strong hairs ; digital joint short, 

 broadest and truncate at its fore extremity, where it is also clothed 

 with long bristly black hairs. The palpal organs are small, of a 

 rather irregular pyriform shape, whose stem (directed backwards 

 close by the side, rather underneath the fore part of the radial 

 joint) is formed by a terminal sharpish-pointed spine. 



The abdomen is of a dull purplish-brown hue, very like that of 

 the European Atypus piceus, Snlz., freckled with small brownish- 

 yellow points, and a transverse kidney-shaped bare yellow-brown 

 patch at the fore extremity of the upperside. The general surface 

 of the abdomen is thinly covered with fine hairs. The spinners are 

 brown ; the two terminal joints of the sujierior pair paler. 



The female resembles the male in colour, but the hinder slope of 

 the caput is more abrupt, and the fore extremity more obtuse. 



Instead of the long projections of the falces, there is on each a 

 simple strong subconical prominence directed a little backwards. 



