1880.] OF THE GENUS ARGYRODES. 341 



The abdomen is large, and of a somewhat imperfectly globular form ; 

 on each side, towards the hinder extremity of the upper part, is a 

 small subconical eminence ; and the hinder extremity itself ends with 

 three larger, subconical, nipple-like protuberances, two in a transverse 

 line below and one in the middle above ; the under ones are the 

 longest, and a little divergent from each other. The colour of the 

 abdomen is dark blackish brown, with a broad longitudinal band along 

 the ujiperside, pointed in front and of a pale yellow-brownish hue ; 

 this band includes the posterior prominences, and emits a prominent 

 stripe of a similar colour on each side a little in front of the middle, 

 and also has along its centre two black patches, of a somewhat 

 diamond-shape ; the anterior patch fits pretty closely into the fore 

 extremity of the band, and is sometimes lost in connexion with the 

 surrounding ground-colour. On each side of the abdomen near its 

 hinder extremity, and beginning at the subconical eminence above 

 noted, another pale yellowish-brown stripe runs downwards and a 

 little obliquely backwards towards the spinners, above which, and in 

 a line with the oblique stripe, is a circular spot or patch of a similar 

 colour. The hinder part of the abdomen is sometimes marked with 

 a similarly coloured band running downwards towards the spinners. 

 Also on each side of the fore extremity of the abdomen, a little above 

 the junction with the cephalothorax, is another, short, rather oblique 

 band or patch of pale yellowish brown, its hinder extremity ending 

 in a largish circular spot. All these pale markings are ornamented 

 with brilliant silvery blotches and spots, two others of which are 

 also conspicuous in a transverse line on the underside a little way in 

 front of the spinners. * 



Three female examples of this very distinct species were contained 

 in a collection of Spiders made for me in Brazil (Parana) by Mr. 

 Henry Rogers. 



Argyrodes nigra, sp. n. (Plate XXX, fig. 20.) 



Adult male, lenjrth l^rline; female 11^. 



The cephalothorax, legs, palpi, falce.=, maxillae, labium, anu sternum 

 of this species are deep black-brown, excepting the two basal joints 

 and a small portion of the posterior extremity of the femora of the 

 legs, which are pale whitish yellow — the abdomen being quite black, 

 without markings of any kind. 



The middle of the ocular area is prominent ; but the lower part of 

 the fore extremity of the caput is devoid of any prominence or pro- 

 tuberance. The eyes of the fore central pair are larger and wider 

 apart than those of the hind central pair ; in other respects the eyes 

 do not appear to differ from those of the typical species of Argyrodes. 

 The relative length of the legs is 1, 4, 2, 3, thus differing from 

 that of other Argyrodes ; the maxillae also are rather less strong, 

 more pointed at their extremity, and inclined perceptibly towards 

 the labium ; the legs are furnished with longish pale hairs, both erect 

 and semi-erect. 



The palpi are slender and moderately long ; the radial and 

 cubital joints are very short; the digital joint is very large ; and the 



