768 REV. O. p. CAMBRIDGE ON NEW ARANEIDEA. [Juiie 21, 



Sternum elongate, strongly dentated or notched ou its sides, at 

 the insertion of the legs. 



Abdomen of a snbtriangular form, the upper side being consider- 

 ably and conically elevated. 



Eriauchenus workmanni, sp. n. (Plate LXVI. fig. 2.) 



Immature male, length from the spinners to the extremity of the 

 maxillae 2h lines ; height from the sternum to the highest point of the 

 caput 2| lines. 



The cephalothorax converges gradually upwards to the anterior 

 portion, which is produced perpendicularly into alongish cylindrical 

 neck, terminating with a large massive caput, the occipital region of 

 which is rounded, and the upper side somewhat flattened and sloping 

 gradually to the insertion of the falces ; at the summit of the caput 

 are four small, pointed, tubercular eminences in the form of a quadr- 

 angle whose posterior side is narrower than the rest. The colour 

 of the cephalothorax, neck, and caput is yellow-brown, marked in 

 ])arts with a darker hue, and thinly clothed with short grey hairs ; 

 just beneath the caput the neck is paler, giving the appearance of a 

 broad pale neck-collar. The whole height of this extraordinarily 

 developed cephalothorax to the top of the caput equals the length of 

 the Spider. 



The eyes are in two groups, one on each side of the fore extre- 

 mity of the caput close to the margin. Each group consists of two 

 pairs, an upper and lower one ; the anterior eye of the upper pair 

 is much the largest of the group, and is seated in front aud rather 

 at the side of a strong bluntish-pointed tubercular prominence, and 

 close to the margin of the caput ; behind this eye is seated the other 

 eye of the pair ; this posterior eye is much smaller and very difficult 

 to discern : taking the two posterior eyes, of the upper pair on each 

 side, as representing the ordinary hind central pair, they are nearer 

 together than those of the fore central pair, i. e. the anterior eyes of 

 the two upper pairs. The lower pair is considerably removed from 

 the upper one ; its eyes are contiguous to each other, and of a pale 

 whitish yellow-brown colour, so like that of the surrounding surface 

 as to he almost imperceptible ; their position is very close to the base 

 of the falces on the outer side, about an eye's diameter from the 

 margin of the clypeus, at the middle of which is a prominent point. 



The legs of the first pair are upwards of five times the length of 

 the Spider, and are considerably longer than any of the rest. All 

 are of a yellowish-brown hue, the femora clouded in parts with a 

 deeper colour ; those of the fourth pair are mostly of a paler yellowish 

 hue with a distinct broadish black-brown annulus about the middle; 

 a broader but less distinct annulus is also placed near the hinder 

 extremity of the tibiae of the third pair ; some indistinct annuli, of a 

 darker yellow-brown than the rest of the surface, are also visible on the 

 more or less mutilated portions of the tibiae and of the metatarsi of the 

 third and fourth pairs. The three terminal tarsal claws, placed at the 

 extremity of a small supernumerary claw-joint, are small and strongly 

 bent ; the superior claws appeared to have only one or two denti- 



