458 Mr. J. Blackwall on new Species of Spiders 



the inner surface; the maxillae are short, straight, and rounded 

 at the extremity; the palpi are robust, and terminated by a fine 

 minutely pectinated claw ; the lip is semicircular ; and the ster- 

 num is heart-shaped. These parts are of a yellowish-white co- 

 lour, the base of the lip being tinged with brown, and the ster- 

 num with green. The abdomen is oviform, convex above, and 

 projects over the base of the cephalothorax ; it is of a pale- 

 yellow colour, reticulated with pale brown, the under part being 

 the least distinctly marked, and has a ramified band of a brown 

 hue extending from the anterior extremity of the upper part 

 about half its length. 



This Sparassus, the. only specimen of the genus in the collec- 

 tion, is especially remarkable for having only a single claw at 

 the extremity of each tarsus. 



Family Theridiid^e. 



Genus Theridion, Walck. 



Theridion t7'ahax, n. sp. 



Length of the female -^ of an inch; length of the cephalo- 

 thorax y^, breadth -yL; breadth of the abdomen -^', length of 

 an anterior leg ^; length of a leg of the third pair -^. 



The eyes are disposed on the anterior part of the cephalo- 

 thorax in two transverse rows, high above the frontal margin ; 

 the four intermediate ones nearly form a square, the two anterior 

 ones (which are placed on a slight protuberance, and are rather 

 nearer to each other than the two posterior ones) being the 

 darkest-coloured of the eight ; the eyes of each lateral pair are 

 seated on a tubercle, and are contiguous. The cephalothorax is 

 compressed before, rounded on the sides, convex, glossy, with 

 an indentation in the medial line of the posterior region ; the 

 falces are conical and vertical ; the maxillae are obliquely trun- 

 cated at the extremity, on the outer side, and inclined towards 

 the lip, which is semicircular; the sternum is heart-shaped, 

 pointed at its posterior extremity, and has small eminences on 

 the sides, opposite to the legs ; the legs are long, and provided 

 with hairs ; the first pair is the longest, then the fourth, and 

 the third pair is the shortest ; each tarsus is terminated by three 

 claws ; the two superior ones are curved and pectinated, and the 

 inferior one is inflected near its base ; the palpi are short, and 

 have a curved, pectinated claw at their extremity. These parts 

 are of a brownish-red colour ; the extremity and inner margin 

 of the maxillae and the apex of the lip have a yellowish-white 

 hue, and the digital joint of the palpi is tinged with brown. 

 The abdomen is oviform, clothed with longish scattered hairs, 

 convex above, and projects over the base of the cephalothorax ; 



