338 REV. O. p. CAMBRIDGE ON SPIDERS [A.pr. 20, 



The legs are of normal character, long and slenJer, 1, 2, 4, 3, 

 and furnished only with fine hairs. 



The transverse cleft dividing the two lohes of the caput is placed 

 as nearly as possible halfway between the hind central eyes and 

 the prominent extremity of the lower lobe. 



The j)('h^^ "^re short, and similar in colour to the legs ; the 

 cubital joint is curved, clavate, and perceptibly longer than the 

 radial, which, like that of other species, is broad in front. The 

 digital joint is of moderate size, oval, dark yellow-brown in colour. 

 The palpal organs are simple, compact, and very like those of 

 several other species. 



The abdomen has its posterior portion drawn out into a long 

 tapering form ; there is a small angular prominence on each side, a 

 little more than halfway to the apex, which last is obtusely pointed 

 and depressed, or a little bent downwards. This downward bend 

 is probabl}' a characteristic of the species, though very possibly not 

 equally strongly marked in all individuals; it is very perceptible in 

 all the examples I have examined (two adult and one young male, 

 and one adult female). The colour of the abdomen is yellow-brown, 

 mostly covered with brilliant and closely united silvery spot?, leaving 

 (in the male) an elongate, central tapering stripe on the upperside. 

 The lower part of the sides, as well as the underside, are nearly 

 free from silvery spots; two, however, are tolerably conspicuous in 

 a transverse line on the liinder part, a little way above the 

 spinners. 



In the female the abdomen is shorter, the angular prominence 

 on each side stronger, and it is more completely covered with silvery 

 spots ; the disposition, however, of those on the upperside leaves a 

 rather distinct pattern (represented in fig. 16, rf) ; probably there 

 would be various differences in this in different examples. The 

 only female that has come under my notice was considerably smaller 

 than the male. 



Four examples were contained in a collection of Spiders made 

 for me on the Parana, Brazil, by Mr. H. Rogers, some years ago. 



Argyrodes obtusa, sp. n. (Plate XXX. fig. 1/.) 



Adult male, length to the apex of the abdomen 1| line, to the 

 spinners rather less than 1 line. 



In this very pretty and curious little Spider, the upper part of 

 the caput is not elevated or drawn out beyond the normal extent, 

 but the whole of the lower part is produced into a very large, obtuse, 

 rounded lobe or prominence divided by a short but distinct cleft or 

 perforation from the upper part of the caput ; when looked at from 

 in front, the middle of the upper part of this prominence is slightly 

 notched or cleft. 



The colour of the cephalothorax is pale yellow-brown, that of the 

 legs and palpi being of a rather paler hue. 



The legs m the examples examined were much damaged; but 

 they appeared to be very like those of other species of this genus, 

 long, 1, 2, 4, 3, slender, and clothed only with very fine hairs, 



