326 REV. O. p. CAMBRIDGE ON SPIDERS [Apr. 20, 



yellow-brown towards the fore extremity of the femora and tibiae, 

 and also on the genual joints. 



The palpi of the male are very similar in form and structure to 

 those of Argyrodes nephilce ; but the structure of the palpal organs 

 differs. They are similar to the legs in colour, the digital joints and 

 palpal organs being of a dark yellow-brown hue. 



The form of the abdomen in the female differs a little from that of 

 the male {vide Plate XXVIII. figs. 5 a, 5 b); the underside in both 

 sexes is of a deep brown or black-brown, with two strong, well- 

 marked points or denticulations on the margin on each side ; a little 

 way also in front of the spinners are two round silvery spots, widely 

 separated in a transverse line. 



Adults of both sexes of this beautiful little Spider were received 

 some years ago from the East Indies through the kindness of Mr. F. 

 Bond. More recently I have received females from Ceylon (from 

 Mr. G. H. K. Thwaites) and from Madagascar (through Mr. R. H. 

 Meade, of Bradford). Three examples of the female were also con- 

 tained in Prof. Traill's Amazons collection. 



The genital aperture of the female is of a deep blackish colour, 

 and is smaller than that of A. nephilce. In almost every example it 

 had an adventitious and more or less prominent process connected 

 with it, of a bright transparent red hue, and apparently of a resinous 

 nature ; so that the real form of the vulva was not easy to be made 

 out. This resinous process appears to be found in some other 

 species also ; and in one, A. cognata, Bl. (Seychelle Islands), it was 

 taken by Mr. Blackwall to be a portion of the sexual process itself. 

 It is, however, I think, certainly adventitious, and formed by an 

 exudation, of the cause and nature of which we are ignorant. 



Argyrodes jucunda, sp, n. (Plate XXVIII. fig. 6.) 



Adult female, length to the spinners 2 lines, and from the spinners 

 to the apex of abdomen 2| lines. 



This Spider is nearly allied to Argyrodes nephilce, Tacz., and 

 others. It is, however, larger ; and the apex of the abdomen is more 

 drawn out and pointed, the abdomen itself being more elevated and 

 perpendicular ; it is of a silvery hue, the silver spots being divided 

 by a network of dull brown hues. On the upperside a broadish 

 central longitudinal black-brown stripe runs from the fore extremity 

 two thirds of the way towards the apex, ending in a broad transverse 

 somewhat crescent-shaped black-brown band, beyond each end of 

 which is an irregular patch of the same. The underpart is black, 

 the black portion extending up the sides in a large somewhat circular 

 form, with a somewhat tapering stripe running upwards on each iiide 

 of the spinners. 



The cephalothorax is of ordinary form, and of a deep brown 

 colour, the clypeus rounded and prominent. 



The legs are moderately long, slender, 1, 2, 4, ,3, and clothed with 

 fine hairs; they are of a yellow-brownish hue; the femora and 

 fore extremities of the tibiae of the first and second pairs deep brown, 

 and all the tarsi and metatarsi pale brownish yellow. 



