captured in Rio Janeiro. 43 



slight golden tinge ; the space comprised within the semicircle 

 and the spinners has a brown-black hue, and a minute silvery 

 spot occurs on each side of the latter, at their base ; the sexual 

 organs are moderately developed, with a longitudinal septum in 

 the middle, and are of a dark reddish-brown colour, that of the 

 branchial opercula being yellow-brown. The cephalothorax is 

 compressed before, rounded on the sides, truncated in front, 

 slightly convex, glossy, with furrows on the sides, converging 

 towards a large indentation in the medial line ; it is of a dull 

 yellow colour, the lateral margins and a small cruciform spot in 

 the medial indentation having a brown hue. The falces are 

 short, powerful, conical, vertical, armed with a few teeth on the 

 inner surface, and of a dull yellow colour, tinged with brown 

 towards the outer side, and of a dark brown hue at the extremity. 

 The maxillffi are divergent, and increase in breadth from the base 

 to the extremity, which is angular on the outer side ; and the lip 

 is semicircular and prominent at its apex. These organs have a 

 brown-black hue. The sternum is heart-shaped, with small 

 prominences on the sides, opposite to the legs, and is of a red- 

 brown colour. The legs are long, slender, provided with hairs 

 and are of a dull yellow colour ; the joints have a dark brown 

 hue at the extremity, and the metatarsi and tarsi are tinged 

 with brown ; the first pair is the longest, then the second, and 

 the third pair is much the shortest ; the tarsi are terminated by 

 claws of the usual number and structure. The palpi are slender, 

 and have a curved slightly pectinated claw at their extremity; 

 they resemble the legs in colour, but the joints are not marked 

 with dark brown at the extremity. The eyes are seated on black 

 spots, and are disposed in two transverse rows on the anterior 

 part of the cephalothorax; the four intermediate ones form a 

 trapezoid whose anterior side is rather the shortest, and those of 

 each lateral pair are placed on a small tubercle, and are nearly 

 in contact ; the two anterior eyes of the trapezoid are somewhat 

 the largest and darkest of the eight. 



This and the preceding species of Tetragnatha belong to M. 

 Walckenaer's second family of the genus, the Coadunata, and 

 bear a marked resemblance to certain spiders of the genus 

 Nephila. 



Tribe Senoculina. 



Family Dysderid^, 



Genus Dysdera, Latr. 



Dysdera crassipalpus. 

 Length of the male fths of an inch ; length of the cephalo- 



