1882.] REV. O. p. CAMBRIDGE ON NEW ARANEIDEA. 431 



The labium is short, not half the length of the maxillae, about as 

 broad as long, and rounded at the apex. 



The sternum is long, and of a triangular form. 



The abdomen is large and of a quadrate form, being blunt-angular 

 in front, behind, and on each side ; the posterior extremity projects 

 beyond the spinners, which (looked at in profile) form another some- 

 what angular prominence ; the anterior portion projects greatly over 

 the cephalothorax. The colour of the abdomen is yellow, generally 

 appearing to fade to a somewhat clayey colour ; on the upperside 

 is a broad, more or less broken, longitudinal central white band, with 

 some lateral blotches or patches of the same colour. The lateral and 

 posterior angles are boldly tipped with black, and five brownish or 

 black marks along the middle indicate the normal impressed spots. 



The male is smaller than the female, and the abdomen is of a 

 narrower form, the lateral angles being scarcely noticeable ; but in 

 colours and markings the sexes are similar. The palpi are short, the 

 radial and cubital joints particularly so ; the digital joint is large, 

 and has its extremities on the inner side considerably produced in a 

 pointed form and somewhat bent ; the convex sides of the digital 

 joints (as is not unusual in some allied genera) are directed inwards 

 towards each other. The palpal organs are tolerably compact but 

 complex, and, though less developed, not much unlike those of C. 

 albomaculata. 



Numerous examples of this pretty Spider, but nearly all females, 

 were contained in collections sent to me some years ago by Mr. G. 

 H. K. Thwaites, from Ceylon. The genus is evidently nearly allied 

 to Euryopis, Menge. 



Genus Thwaitesia, Cambr. 



Thwaitesia affinis, sp. n. (Plate XXXI. fig. 8 a.) 



Adult female, length 2| lines. 



Tliis Spider is very like Thwaitesia marffaritif era, C&mhr. (the type 

 of the genus, found in Ceylon). The abdomen is of a similar dull lu- 

 teous-yellowish hue, ornamented with numerous brilliantly shining 

 white, pearly, silvery scale-like blotches ; and it also has its posterior 

 extremity produced upwards in a conical form, so that looked at 

 sideways the abdomen is as nearly as possible an equilateral triangle. 

 In the type (from Ceylon) the abdomen is much more produced. 

 The legs are also rather stronger and shorter than in the type, and 

 are armed with fewer distinct spines, while the hairs are stronger 

 and of a more spine-like bristly nature. The colour of the legs is a 

 dull orange, suffused with deep orange-brown at the far extremities 

 of the tibise and metatarsi, a small portion of the base of the latter 

 being also similarly suffused. 



The ocular area (or rather the space within the eyes) is raised in 

 a more convex form ; and the genital aperture is smaller and of a 

 totally different form. 



Each tarsus (in both species) ends with a strongish, black, curved 

 pectinated claw. 



A single example in Mr. Traill's Amazon collection. 



