captured in Rio Janeiro. 31 



seated obliquely on a prominent tubercle^ and are separated by 

 a moderately wide interval. The abdomen is broad, triangular, 

 and terminates in a point situated high above the spinners ; it 

 is clothed with light-coloured hairs, which are longest in front, 

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

 is of a brownish-yellow colour, with a large brown triangular 

 mark on the upper part, comprising within its broad anterior 

 base four indented spots, which nearly form a square ; the two 

 posterior ones are larger and rather wider apart than the two 

 anterior ones, and there is a small glossy convexity near its 

 vertex, bearing a strong resemblance to a small eye ; the sides 

 are marked with obscure, slightly oblique, brown lines, and on 

 the under part there is a large soot-coloured angular mark, 

 whose vertex is near the spinners, which are encircled by pale 

 yellow spots ; the sexual organs are highly developed, with a 

 long, pointed, spine-like process directed downwards from their 

 anterior margin, and have a yellowish-brown hue. ' 



The sexes bear a general resemblance to each other in colour; 

 but the male, which is the smaller, differs from the female in 

 various particulars. The anterior prominence of its cephalo- 

 thorax, on which the four intermediate eyes are seated, is nar- 

 rower and more protuberant. The legs are more abundantly 

 supplied with spines, those on the inner side of the somewhat 

 enlarged extremity of the slightly curved tibise of the second pair 

 being the most numerous ; a transverse row of short spines occurs 

 at the extremity of the coxa of each posterior leg, on the under 

 side, and there is a short, curved, red-brown process on the under 

 side of the extremity of the coxa of each anterior leg : these Umbs 

 are somewhat irregularly marked with dark brown. The falces 

 are slender, have a conical process at the base, in front, and are 

 not tinged with brown at the extremity. The base of the maxillae, 

 lip, and margins of the sternum have a brown hue. The abdo- 

 men has some long coarse hairs, more or less erect, on its upper 

 part, and the branchial opercula have a dark brown hue. The 

 palpi are short ; the cubital joint has a long bristle directed for- 

 wards from its extremity, and the radial joint is very protuberant 

 underneath ; the digital joint is large, of an oblong-oval form, 

 tapering to a point, and has a long process at its base, greatly 

 curved outwards, whose enlarged extremity has a dark red-brown 

 hue ; it is convex and hairy externally, concave within, and with 

 this concavity the palpal organs are connected ; they are very 

 highly developed, very prominent and complicated in structure, 

 with a pale yellow transversely striated piece at the base, in 

 front, and a large slightly curved process extending along the 

 upper side, whose broad recurved extremity projects two short 

 strong processes curved towards each other ; on the under side 



