Mr. R. I. Pocock on the Oenus Urodacns. 175 



Hand generally resembling in appearance that of U. arma- 

 tus {cf. measurements). 



Pectines projecting posteriorly as far as the distal margin 

 of posterior coxee ; number of teeth 11-12. 



Colour piceous, legs paler. 



Measurements in millimetres. — Ceplialothorax, length 6f 

 width 7^, as long as the first caudal segment + the second and 

 one fourth of the third ; length of tail 25^, i. e. about three 

 and two third times as long as cephalothorax ; length of fifth 

 caudal segment 6, width 2|, height 2^ ; length of vesicle and 

 aculeus 5| ; length of humerus 4^, of brachium 5|, of hand- 

 back 5^, of movable finger 6 ; width of hand 5, height 4^ ; 

 length of pecten 4, of tooth ^. Total length 47. 



Of this species I have seen two dried females, one ticketed 

 Adelaide, the other merely New Holland. 



Synoptical Table of Species. 



a. Hands smooth, with scarcely a trace of keels ; 

 cephalothorax laterally smooth, not gran- 

 ular excellens, sp. n. 



6. Hands strongly keeled ; cephalothorax late- 

 rally granular. 

 a}. Right and left portions of ocular tubercle 

 abruptly terminating behind the eyes ; 

 cephalothorax marked behind with a 



hammer-shaped depression ahniptus, sp. n. 



b^. Right and left portions of ocular tubercle 

 not abruptly terminating behind the eyes, 

 but continuous -with the margins of an 

 equilaterally triangular depression. 

 a*. Superior keels of the four proximal 

 caudal segments in male produced be- 

 hind into a large, sharp, upwardly 



directed tooth armafus, sp. n. 



b', Superior keels of the four proximal 

 caudal segments in male not produced 

 into a large tooth novce-hollandice, Peters. 



EXPLANATION OF PLATE VIII. 



Fig.\. Urodacus novcB-hollandiee, Vetera, J- Nat. size. 



Fiff. 1 a. The same. Tail. 



Fig. 2. Urodiicus excellens, sp. n., 2 • Nat. size. 



Fi(/. 2 a. The same. Sternum and pectines. 



Fi(/. 3. Urodacus armatus, sp. n., c? . Nat. size. 



Fig. 3 a. The same. Tail. 



Fig. 4. Urodacus abruptus, sp. n., 5 • ^*t. size. 



Fig. 4 a. The same. Cephalothorax, x 2. 



