74 Mr. E. T. Pocock on 



lobe much less strongly produced ; also there is not such an 

 elongate space on the proximal side of the first pectinal tooth 

 as is seen in S. megacephalusj the superior caudal keels are 

 much more granular, the vesicle is less globular, and the 

 aculeus more abruptly curved in its distal half; and, lastly, 

 although I have seen nineteen specimens of S. megacephalufij 

 mostly from Ceylon, eiglit of which are males varying in 

 length from about 95 to 122 millim., yet none of them present 

 any very marked elongation of the palpi ; whereas of *S'. Phip- 

 soni I have seen in the Museum collection eleven specimens, 

 six of which are males varying in length from 92 to about 

 190 millim., and they all present that elongation of the palpi 

 that has been described. 



Immature specimens of the two species now under dis- 

 cussion are, as might be expected, very difficult to recognize 

 from each other ; and in my diagnosis of the species I men- 

 tioned two specimens in the Museum collection from Madras, 

 which I now believe to be referable to S. megacephalus of 

 C. Koch. 



Scorpio latimanus, sp. n. 



Colour castaneous, with yellow legs. 



Carapace finely granular laterally, the frontal lobes sub- 

 granular and wrinkled ; the anterior excision very shallow 

 and the lobes consequently rather squared, almost as in 

 Mi'aphonus, longer than the first two caudal segments and 

 half the third. 



Tergites mostly smooth and polished, weakly granular at 

 the sides, the last more coarsely granular laterally, but scarcely 

 carinate. 



Sternites smooth and polished, the last furnished with four 

 distinct smooth keels. 



Tail short, only a little more than three times the length 

 of the carapace, posteriorly narrowed, the first segment one 

 third wider than the fifth (6:4); the third segment as long 

 as wide, the fifth twice as long as wide; the superior keels of 

 segments 1 to 4 smooth, subcrenulate on the fourth, the infe- 

 rior keels well developed and also smooth, although roughened 

 with punctures on the fourth, those on the first segment as 

 strong as those on the second ; fifth segment with its upper 

 keels weakly denticulate ; vesicle wider than the fifth seg- 

 ment, serially granular beneath (aculeus fractm-ed). The 

 terminal fang of the immovable digit of the chelicerffi very 

 long. 



Palpi robust ; humerus granular and convex above, denti- 

 culate in front ; hrachium smooth, subcostate, not granular ; 



