372 Mr. R. I. Pocock on 



Pectlnal teeth 17. 



Measurements in millimetres. — Total length 62 ; carapace 9 ; 

 tail 36, length of its first segment 4, of its fifth 8*6 ; width 

 of hand 6'5, height 48; length of underhand 7'5, of 

 finger 9 5. 



Loc. Queensland : Cape York Promontory. 



In many respects the type of this species resembles thit of 

 U. armatus, Poc, which was from Port Lincoln in South 

 Australia. If the two had come from the same locality, I 

 should have l^een inclined to regard tiiem as sexes of one and 

 the same species, in spite of the fact that the superior lateral 

 keels of the first four caudal segments are smooth or nearly 

 so in U. armatus and sharply granular in U. subarmatus. 

 This structural character, coupled with the difference in 

 distribution, completely justifies tiie view of the specific 

 distinctness of the two forms. 



Kraepelin's statements (Das Tierr., Scorpiones, p. 103, 

 1899), that U. armatus and U. hoplurus are characterized by 

 the presence of a single row of teeth extending nearly 

 throughout the length of the movable finger of the chela, 

 that the last abdominal sternum is without conspicuous 

 keels, and that the underside of the brachium is also keelless, 

 have no foundation in fact. 



Urodacus simplex, sp. n. 



^ . — Colour a uniform yellowish brown. 



Carapace with squarely truncate anterior border and deep 

 median angular notch, with a small triangular sclcrite in the 

 middle; anteocular area smooth, very finely punctured, with 

 a few granules in front ; lateral portions of cai'apace sha- 

 greened ; ocular ridges not continuous behind with the ridges 

 bordering the posterior impression. 



Terga finely and closely granular, smoother in the middle ; 

 the last with only a small number of larger granules marking 

 the lateral keels, which are so prominent in most other 

 species. 



Tail about four times as long as the carapace, w hich is a 

 little shorter than segments 1+3 or 3+4 and only a little 

 longer than 5; sides of segments lightly convex; segments 

 1-4 smooth except for a few lateral granules; inferior keels 

 smooth, superior and superior lateral keels granular or sub- 

 denticulated, the former a little elevated posteriorly ; fifth 

 segment with granular intercarinal spaces ; the inferior 

 median keel double. 



Chehe with brachium distinctly though finely granular 



