lately discovered in England. 437 



the base, divergent at the extremity, and armed with strong, 

 sharp teeth on the inner surface. 



Maxilla obliquely truncated at the extremity on the outer 

 side, slightly curved and inclined towards the labium : these 

 last parts (maxillse and falces) resemble the legs in colour, though 

 perhaps a trifle more suffused with brown. 



Labium semicircular and prominent at the top. 



Sternum broad and heart-shaped : these parts are of a dark- 

 brown colour. 



Abdomen longish oval, hairy, and projecting a little over the 

 base of the cephalothorax ; colour dark greenish brown, with a 

 leaden hue ; branchial opercula dull yellow. 



An adult male of this species was sent me by the Rev. T. W. 

 Huthwaite, who captured it at Calke Abbey, near Derby, in the 

 summer of 1860. I have received from Mr. Huthwaite many 

 other rare and interesting species captured in the same and other 

 localities ; and I have great pleasure in naming after its captor 

 the present species, which appears new to science. 



Genus WALCKENAiiRA. 



TValckenaera unicornis. 



Abdomen black-brown ; rest of the spider dark brownish red, ex- 

 cept the legs, which are reddish yellou) : frontal eminence mode- 

 rate ; from the top of it, in the centre of the four pairs of eyes, 

 there rises a short vertical projection, the top of which is en- 

 larged and slightly notched, but without any hairs on it : radial 

 joint of palpi with two projections — a long, bifid, hairy, obliquely 

 curved one in front of the digital joint, and a short blunt one 

 underneath it ; palpal organs very highly developed and com- 

 plicated. 



Adult male. — Length -^ of an inch ; length of cephalo- 

 thorax ^V* breadth ~ ; relative length of legs 4, 1, 2, 3. 



Cephulotliorax oval, prominent before, with a short vertical 

 projection issuing from the middle of the space occupied by the 

 eyes ; this projection is enlarged and notched at the top, and is 

 much paler in colour than the rest of the cephalothorax, which 

 is of a dark brownish red. 



Eyes eight, on front and top of cephalothorax, in four pairs 

 forming two cross rows curved from each other ; the hinder row 

 much more strongly curved than the front one. The two middle 

 eyes of the front row are much closer together than the two 

 middle ones of the hinder row, and are the smallest of the eight; 

 the eyes of the two side pairs are placed on a small tubercle, and 

 touch each other. 



Legs slender, furnished with hairs, and of a yellowish-red 



