captured in Rio Janeiro. 35 



red colour, that of the extremity of the falees being brownish- 

 black. The maxillae are shorty strong, straight, and greatly en- 

 larged and rounded at the extremity ; the lip is semicircular, 

 but somewhat pointed at the apex ; and the sternum is heart- 

 shaped, with small prominences on the sides, opposite to the 

 legs. These parts are of a brownish-black colour, the extremity 

 of the maxillae and the apex of the lip having a pale yellowish- 

 brown tint. The eyes are seated on black spots on the anterior 

 part of the cephalothorax ; the four intermediate 5nes are placed 

 on a prominence and nearly form a square, the two posterior 

 ones being the largest of the eight ; the eyes of each lateral pair 

 are seated on. a small tubercle, and are near to each other, but 

 not in contact. The figure of the abdomen is oblong-oviform, 

 with three conical protuberances at the anterior extremity of the 

 upper part, the intermediate one of which is much the largest, 

 and is directed forwards ; the posterior extremity is rounded, 

 and extends considerably beyond the spinners; it is glossy, 

 thinly clothed with short hairs, and projects greatly over the 

 base of the cephalothorax; the colour of the upper part is black, 

 a longitudinal pale yellow band extending from the point of each 

 protuberance to its posterior extremity; the intermediate band 

 is the broadest, and in the black space on each side of it there 

 is a longitudinal row of orange-brown spots ; the sides are black, 

 with a row of orange-brown spots extending along their upper 

 part, and immediately below it there is a parallel row of minute 

 pale yellow spots ; the inferior surface of the anterior extremity 

 has an orange-red hue, and the under part is of a pale yellow 

 colour, with a broad black band, including the sexual organs and 

 spinners, extending along the middle ; beyond the spinners 

 three transverse pale yellow spots occur; the branchial opercula 

 have a brown hue, and the sexual organs, which are prominent 

 and glossy, have a small, obtuse, slightly curved process, con- 

 nected with their posterior margin, which is directed backwards. 

 Some individuals have a short yellow streak in the medial line 

 of the anterior part of the sternum. 



The male is smaller and less distinctly marked than the female, 

 but the design formed by the distribution of their colours ia 

 similar in both sexes. The legs of the only male I have seen 

 were mutilated, but judging from the dimensions of the femora, 

 which remained entire, it would appear that in their relative 

 length they do not differ from those of the female : the colour of 

 the femora of the first and second pairs is brownish-black, with 

 the exception of the base, which has a brownish-yellow hue. The 

 palpi are short, and of a brownish-yellow colour, the digital 

 joint excepted, which has a brown-black hue; the radial is 

 stronger than the cubital joint, and is prominent on the outer 



3* 



