from the East of Central Africa. 349 



of various shapes and sizes ; sixteen occur on the margins, two 

 in the medial line, and two on each side ; the two smallest are 

 situated on the frontal margin, and between them there are two 

 others of an oval form ; these latter spots are followed by a cir- 

 cular one in the medial line, to which succeeds a large one of 

 an oblong heart-shape, veined with pale-brown; the anterior 

 spot on the side is large and reniform, and the posterior spqt is 

 connected with a marginal one ; the under part is much corru- 

 gated, and of a brownish-black colour, that of the spinners, 

 which are encircled by a rim, being dark-brown ; a large semi- 

 circular band behind the spinners, and the space surrounding 

 the pedicle by which the cephalothorax is attached to the abdo- 

 men, including the branchial opercula, are of a yellow hue, with 

 transverse, forked, soot-coloured lines; the sexual organs are 

 moderately developed, and of a dark-brown colour, tinged with 

 red, that of the anterior margin, which is semicircular and rather 

 prominent, being brownish-yellow. 



This elegantly marked Eurysoma, two specimens of which 

 were comprised in the collection, is dedicated to the memory of 

 of the late Richard Thornton, Esq., whose premature death, 

 deeply deplored by his friends, has removed from his sphere of 

 usefulness here an intelligent and zealous votary of natural 

 science. 



Eurysoma Walleri. 



Length of the female ^ths of an inch ; length of the cephalo- 

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

 a posterior leg -iJ-; length of a leg of the third pair -^. 



The cephalothorax is convex, depressed towards the extremi- 

 ties, glossy, compressed befere, broadly truncated in front, 

 rounded on the sides, which are marked with slight furrows con- 

 verging towards an indentation in the medial line of the poste- 

 rior region, and is of a brownish-yellow colour. The falces are 

 short, powerful, conical, armed with teeth on the inner surface, 

 inchned towards the sternum, and of a brown hue, tinged with 

 yellow on the sides and at the base. The maxillse are straight, 

 and enlarged and rounded at the extremity ; the lip is semi- 

 circular ; and the sternum is heart-shaped, with eminences on 

 the sides, opposite to the legs. These parts have a yellow hue, 

 the maxillse and lip being tinged with brown. The eyes are 

 situated near the frontal margin of the cephalothorax; the four 

 intermediate ones are seated on a protuberance, and form a 

 square, the two anterior ones being the largest and darkest- 

 coloured of the eight ; the eyes of each lateral pair are placed 

 apart on a tubercle, and are distant from the four intermediate 

 ones. The legs are short, provided with hairs, and are of a 

 yellow colour, with brownish-black annuli, each femur having a 



