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



Argyrodes ululans, sp. n. (Plate XXX. fig. 14.) 



Adult male, length from the fore extremity of the caput to the 

 spinners 1^ line, and to the apex of the abdomen 2| lines ; the 

 corresponding measurements of the adult female are 2 and 4 lines. 



The cephalothorax, legs, palpi, and falces are of a deep yellowish- 

 brown colour. The legs are rather the palest, they are long and 

 slender, 1, 2, 4, 3, and furnished with fine hairs. The fore part of 

 the caput is divided into two lobes, like many others of the genus ; 

 but the form of the lobes is very distinct from that of any other 

 species, and very characteristic. The inferior lobe is very strong, 

 obtuse, and, looked at in profile, projects a little beyond the upper 

 one, which is much smaller and transversely impressed just in 

 front of the fore central pair of eyes. These lobes are, like the 

 corresponding ones in other species, clothed with hairs, which are 

 directed over the intervening cleft. 



The ahdomen is greatly produced backwards, tapering to a 

 blunt conical point; its length from the spinners to the apex is 

 nearly or quite double that from the spinners to the cephalothorax. 

 It is of a dull sooty-black hue, deepening to the apex ; the upper 

 part is bordered on each side by a broad longitudinal silvery band, 

 which does not, however, nearly reach the apex ; and close behind 

 the spinners, underneath, are two silvery spots in a transverse 

 line. 



The 'palpi are moderately long ; the radial and cubital joints are 

 rather short, and of very nearly equal length ; the digital joint is 

 large, oval, and devoid of the strong process near the extremity 

 characteristic of that o? Argyrodes epeirce, Sim., and several others. 

 The palpal organs are compact and moderately complex, but do not 

 present any very conspicuously prominent processes. 



The female is larger, and its abdomen stouter ; but in colours and 

 markings the sexes are remarkably alike. 



Examples of this species were contained in Prof Traill's Amazons 

 collection. 



Argyrodes minax, sp. u. (Plate XXIX. figs. 15, c, d, e, 15 a, 



Adult male, length to the spinners 1^ line, and to the apex of the 

 abdomen 2 lines. 



In the form of the caput this Spider is very like the next species 

 (^Aryyrodes affinis, Cambr.). In both Spiders the clypeus is 

 prominent, and divided by a distinct transverse cleft, almost 

 amounting to a simple perforation, so nearly do the adjacent margins 

 of the two segments meet. The present Spider, however, may be 

 distinguished at once by the greater and more gradual rise of the 

 caput from the thoracic region, and by the cleft above mentioned 

 dividing the clypeus into two equal parts, whereas in A. affinis it is 

 placed close beneath the fore central eyes (Plate XXX. fig. l(i b). 

 A comparison of the figures given of the two Spiders will render 

 this apparent at a glance. 



