43S REV. O. p. CAMBRIDGE ON NEW ARANEIDEA. [May 16, 



Maxilla rather long, strong, enlarged and rounded at their 

 extremities. 



Labium broad, and considerably bent in, transversely, above its 

 connexion with the sternum ; it is about half the length of the 

 maxillse, and somewhat pointed at the apex. 



The sternum is heart-shaped, hollowed at the anterior extremity, 

 and with slight eminences opposite to the insertions of the legs. 



Abdomen "short and broad, but with its anterior portion greatly 

 elevated and produced into a long, slightly tapering, curved pro- 

 jection, which bends forwards over the cephalothorax. 



It is probable that this genus is allied to Mastigosoma, Auss., 

 and Cyphagogus, Giinther, as well as to Poltys, C. L. Koch. 



WixiA ABDOMiNALis, sp. u, (Plate XXXI. fig. 13.) 



Adult female, length 3| lines, length of abdomen (from the hinder 

 extremity to the end of the anterior projection) rather over 4| lines. 

 The cephalothorax and falces are yellow-brown ; the clypeus, as 

 well as a short, broad, oblique band towards the base of the falces, 

 brown ; the extremities of the falces deep brown ; the surface of the 

 cephalothorax is covered pretty thickly with short greyish hairs. 



The eyes of the central group do not differ much in size. Those 

 of the posterior pair are of a pale yellowish pearly colour, and seemed 

 to be rather smaller than the anterior pair, which form, however, a 

 shorter line, being dark-coloured and separated by no more than an 

 eye's diameter. 



The legs are dull brownish yellow, of a somewhat flattened shape, 

 though not so much flattened as in Poltys or Coerostris; besides 

 the spines mentioned above, they are clothed with numerous greyish 

 and other hairs. The tarsi are short. 



The palpi are moderate in length and strength, and similar in colour 

 and armature to the legs ; each ends with a curved claw furnished 

 with longish pectinations. 



The maxillte and labium are dark brown tipped with whitish ; and 

 the sternum is similar in colour to the legs. 



The abdomen is of a dull luteous kind of yellow-brown, clouded or 

 suffused with a sooty-brown hue in front of the anterior elevation, of 

 which the apex is bifid, each point ending with a round shining 

 tubercle ; on the hinder half of the abdomen are four largish im- 

 pressed pit-hke black spots, followed towards the spinners by two 

 longitudinal converging rows of small diminishing deep-brown spots 

 which look like tubercles ; others, of a like nature, are disposed 

 more or less regularly in two rows round the margins. The under- 

 side is dark sooty brown ; and the genital apertiire is large, with a deep 

 red-brown shining tubercular somewhat oval prominence on each 

 side of it. The whole abdomen is clothed with short greyish and 

 other hairs; between the four large impressed spots on the hinder 

 part are some blackish irregular markings. 



A single example of this curious Spider was contained in Mr. 

 Traill's Amazon collection, and appears to me to belong to an un- 

 characterized genus. 



