captured in Rio Janeiro. 437 



the under part has a brownish-black hue, and there is an oblong 

 white spot immediately behind the sexual organs ; these organs 

 are moderately developed, with a longitudinal transversely stri- 

 ated septum in the middle, whose anterior extremity is directed 

 forwards, and whose posterior extremity is much the broadest ; 

 they are of a yellowish-brown colour, marked with dark brown 

 at their termination. The eyes are disposed on the anterior part 

 of the cephalothorax ; the four intermediate ones nearly form a 

 square, the two anterior ones, which are seated on a protuberance, 

 being slightly wider apart than the posterior ones; the eyes of 

 each lateral pair are placed horizontally on a minute tubercle ; they 

 are separated by a conspicuous interval, and the posterior ones 

 are the smallest of the eight. The cephalothorax is compressed 

 before, rounded in front and on the sides, convex, depressed be- 

 fore, abruptly so at the base, with a narrow indentation in the 

 medial line ; it is clothed with hoary hairs, and of a yellowish- 

 brown colour, with narrow dark brown lateral margins, and a 

 dull yellow triangular spot at the posterior point of the cephalic 

 region. The falces are powerful, conical, vertical, and armed 

 with teeth on the inner surface; the maxilla? are short, straight, 

 and enlarged at the extremity; and the lip is semicircular, but 

 somewhat pointed at the apex. These parts are of a dark brown 

 colour, the first at the base in front, and the last two at their 

 extremity, having a yellowish-brown hue. The sternum is heart- 

 shaped, with small eminences on the sides opposite to the legs; 

 it is of a pale dull yellowish colour, with a dark brown band 

 extending along each side; these bands meet at its posterior 

 extremity, and have their inner margin sti'ongly sinuous. The 

 legs are long, provided with hairs and a few spines, and are of a 

 yellowish-brown colour, with brown annuli, those at the extre- 

 mity of the femora of the first, second, and fourth pairs being 

 the broadest, and, with the genua, almost black ; the first pair 

 is the longest, then the second, and the third pair is the shortest ; 

 the tarsi are terminated by claws of the usual number and struc- 

 ture. The palpi resemble the legs in colour, and have a curved 

 pectinated claw at their extremity. 



Epe'ira gracilipes. 



Length of the male ^th of an inch ; length of the cephalo- 

 thorax jj-, breadth ~; breadth of the abdomen T i ff ; length of 

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



The legs are very long, slender, provided with hairs and 

 spines, and of a pale reddish-brown colour, the femora and the 

 extremity of the tibiae of the anterior pair and the extremity 

 of the tibiae of the second pair having a dark brown hue ; the 



