42 Mr. J. Blackwall on newly discovered Spiders 



the palpi are slender, and have a curved slightly pectinated claw 

 at their extremity. These parts are of a dull yellow colour, the 

 metatarsal and tarsal joints of the legs and the digital joint of 

 the palpi being tinged with brown. The raaxillge are slightly 

 divergent, and increase in breadth from the base to the extre- 

 mity, which is somewhat angular on the outer side ; and the lip 

 is semicircular. These organs are of a red-brown colour. The 

 abdomen is subcylindrical, sparingly clothed with short hairs, 

 and projects a little over the base of the cephalothorax ; the 

 upper part and sides have a bright silvery lustre, with a slight 

 golden tinge, which is deepest on the latter, and a dark brown 

 ramified band extends along the middle of the former ; the pos- 

 terior extremity, which projects considerably beyond the spinners, 

 has a yellowish-brown colour, and comprises two parallel spots 

 of a silvery lustre placed transversely; the -under part has a 

 yellowish-brown hue, with minute spots and a somewhat semi- 

 circular transverse band of a silvery lustre with a slight golden 

 tinge ; the sexual organs are small, and of a dark reddish-brown 

 colour, with a yellowish-brown longitudinal septum in the mid- 

 dle ; and the branchial opercula have a dull yellow hue. 



Tetragnatha formosa. 



Length of the female |th of an inch ; length of the cephalo- 

 thorax j^(, ; breadth -^^ ; breadth of the abdomen j^ ; length of 

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



The abdomen is robust, subcylindrical, very prominent at the 

 anterior extremity, and projects greatly over the base of the 

 cephalothorax ; the upper part and sides have a bright silvery 

 lustre, the latter having a slight golden tinge ; along the middle 

 of the former a black band extends, which is crossed near its 

 anterior extremity by a strongly curved brownish-black line, 

 within whose curvature there is a short transverse line of the 

 same hue ; on each side of the medial baud a shorter parallel 

 black band occurs ; these bands, which commence near the ex- 

 tremities of the curved line, are connected anteriorly by a trans- 

 verse black line, and laterally by four oblique lines of the same 

 hue, disposed in pairs and inclined towards each other ; on each 

 side there are two longitudinal brownish-black bands, the supe- 

 rior one of which is connected at its posterior extremity with 

 the lateral band of the upper part by a black bar ; the posterior 

 extremity of the abdomen is black, and comprises eight silvery 

 spots disposed in pairs, which diminish in size as they approach 

 the spinners, towards which they converge ; the under part is of 

 a brown colour, with minute spots, a short streak directed back- 

 wards from the posterior margin of each branchial operculum, 

 and a somewhat semicircular band, of a silvery lustre, with a 



