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



side, and rounded on the outer extremity, showing a considerable 

 constriction about the middle of the outer side. 



Labium about half the length of the maxillse, somewhat obtusely 

 pointed at the apex, and narrower at the base than at the middle. 



Sternum elongate-oval, pointed behind and hollow-truncate before. 



Abdomen short, broad, round-oval, of a flattened form, rather 

 truncate before, and fitting well up to the base of the cephalothorax. 



Casturopoda sigillata, sp. n. (Plate XXXVII. fig. 5.) 



Adult female, length 2f hues. 



The colour of the cephalotJiorax, falces, legs, and palpi is a rich 

 dark mahogany-brown. 



The surface of the cephulotlwrax and falces has a roughened 

 appearance, being granulose or punctuose ; the latter, as well as 

 the sides and hinder part of the former, are furnished with short 

 bristly hairs; the fore margin of the caput has also a single row of 

 short strong prominent bristles. The height of the clypeus is only 

 equal to the diameter of one of the fore-central eyes. 



The maxillce, labium, and sternum, as well as the basal joints of 

 the legs, are yellowish brown. 



The eyes of the hind-central and fore-central pairs are respectively 

 nearer together than each is to the lateral eye of its row on the same 

 side. 



The abdomen is of a dark greenish olive-brown hue, deepest on 

 the upperside, which is of a somewhat coriaceous nature, and where 

 there are in a transverse line on the middle two large oval rusty- 

 brown seal-like markings, near together, and each marked in the 

 centre with one of the two posterior of the five normal Thomisid 

 impressed spots or markings, and of a deeper red-brown colour ; 

 the other three of these normal spots form a triangle immediately 

 in front of the sigilliform markings, the apex directed forwards 

 and close to the fore extremity of the abdomen. A pale yellowish 

 streak or line runs from the apex of this triangle to a little way 

 beyond the posterior impressed spots, and is succeeded by several 

 short transverse pale curved lines, from the ends of each of which 

 similar lines run parallel to each other round the sides and outer 

 portion of the upperside of the abdomen. In some parts these lines 

 are formed by small pale dots. The spinners are short and of a 

 pale dull yellowish hue. The abdomen is thinly clothed with short 

 hairs. 



The whole Spider has a very flattened form. 



An adult and an immature feniale, as well as an immature male, 

 were sent to me some years ago from Ceylon by the late Mr. G. H. 

 K. Thwaites. The size and peculiar form of the anterior pair of 

 legs make this Spider a very remarkable one. This character, 

 together with its other structural features, have induced me to base 

 a new genus upon it, though it has some strong points of affinity to 

 the preceding species Cyrsillus drassiformis (p. 358, antea). 



