370 Ih: R. I. Pocock on 



xi. p. 58, 1894 ; id. Das Tierr., Scorpiones &c. p. 120, 1899), 

 described from Homran, differs from P. Percivali in the 

 tliiek and coarse granulation of the underside of the humerus 

 of the chela and in having only three instead of four spines 

 on the tarsal lobes, only two keels on the upperside of the 

 hand, &c. 



Genus Urodacus, Peters. 

 Urodacus spinatus, sp, n. 



cJ . — Allied to U. hoplurus, Poc. (Ann. & ]Mag. Nat. Hist. 

 (7) ii. p. 64, 1898), from Lawlers, Western Australia, but 

 differing in the following features : — 



The frontal portion of the carapace is smooth, polished, 

 and finely punctured, not tubercular ; its median area bearing 

 the eyes is not elevated. The two granular crests on each 

 side of the last abdominal teryite extend well past the middle 

 of the plate, the external reaching further than the internal ; 

 in U. hoplurus the external barely reaches the middle, the 

 internal falls far short of it. 



Tail longer and thinner than in U. hoplurus, almost six 

 times as long as the carapace, which is as long as its first 

 segment + :^ of the second or as the foui'th ; first segment 

 about twice as long as wide, the fourth four times as long as 

 wide ; superior keels of segments 1-4 weakly denticulated 

 and terminating in a high, erect, triangular spike like that of 

 U. hopAurus ; inferior keels of the fourth distinctly but weakly 

 denticulated ; in U. hoplui'us these keels are smooth ; vesicle 

 weakly and sparsely granular, as wide as the second caudal 

 segment, wider than the fifth, its height about equal to the 

 width of the fourth. 



Chelae much flatter than in U. hoplurus, the upperside of 

 the brachium defined behind by a keel ; the keel on the hand 

 stronger than in U. hoplurus, the height of the outer surface 

 of the hand equal to about half its length along the keel of 

 the underhand ; inferior pores on brachium and hand as in 

 U. hojAurus', movable finger about as long as carapace. 



Five posterior protarsal spines on first leg, six on second 

 and third legs ; in U. TiopAurus there are five of these spines 

 on the first and second legs and four on the third leg. 



Pectinal teeth 20-21. 



Measurements in millimetres. — Total length 93 ; carapace 

 10; tail 68; length of first segment of tail 7o, length of 

 fifth segment 15 ; width of vesicle 3'5 ; height of hand 5; 

 length of underhand 8 ; width of hand 6'3. 



Lac. Queensland • Cape York Promontory. 



