354 REV. O. p. CAMBRIDGE ON NEW SPIDERS. [June 5, 



Sarpedon robxjstum, sp. n, (Plate XXXVI. fig. 1.) 



Adult female, length 5.| lines. 



The cephalothorax is of a rich dark reddish-brown hue, clothed 

 thinly with long bristles, chiefly on the caput. 



The ler/s and palpi are yellowish, the basal joints tinged with 

 brown and strongly suffused with deep reddish brown, chiefly on the 

 anterior half of the joints. 



The sternum and labium are similar in colour to the basal joints 

 of the legs. 



TheyaZces are of moderate length and strength, and not quite so 

 ricli in colour as the cephalothorax. 



The abdomen is of a deep blackish brown tinged with a purplish 

 hue, and pretty thickly clothed with hairs, mostly short ; it has on 

 its upperside two longitudinal curved converging rows of yellowish 

 macula?, the anterior ones indicating the position of the heart, and 

 the posterior ones forming the usual transverse angular lines or 

 chevrons. 



So distinct a pattern is not usual in this family, and bears much 

 resemblance to that found in the genus Amavrobius. 



On the underside the four spiracular plates are of a brownish-yel- 

 low colour, and behind them towards the spinners are four maculae 

 of the same hue, and forming nearly a square. 



Two examples of the female of this very distinct and remarkable 

 Spider (which appears to be allied to the S. -African genus Mog- 

 gridgea, Cambr.) were received a few years ago from the late Mr. G. 

 H. K. Thwaites from Ceylon. Nothing is known of its habits ; but 

 I should not be surprised to learn that it was one of those Spiders 

 which form a trapdoor nest, though not excavating a hole for itself, 

 to do which it has none of the requisite armature either on the falces, 

 palpi, or legs. 



Atypina. 



Atypoides, g. n. 



Cephalothorax oblong-oval, rather truncate before the caput, rising 

 gradually (but not to a great height) to the eyes from the thorax, 

 which is rather depressed. Tlioracic indentations strong ; that at 

 the junction of thorax and caput longitudinal. 



Eyes of fair size for this family, and not greatly unequal, situated 

 at the apex of the somewhat drawn-out fore extremity of the caput, 

 two in a transverse line, less than half a diameter's distance from 

 each other, in the centre, with three others close on the outerside of 

 each, in a compact triangle, the anterior eye in each triangle being 

 the largest of the eight. The central eyes are dark grey, the rest 

 shining pearl-white. 



Legs moderately long and strong ; relative length apparently 4, 1, 

 2, 3, but their absolute length not greatly different; furnished with 

 spines of varied length and strength, strongest and most numerous 

 in the female ; the metatarsi and tarsi, however, of the first pair 

 are devoid of them in the male. 



