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rule than the segments of the tail. The upper elevated portion 

 of the carapace quite smooth and polished, without a trace of 

 granules ; the margins of the frontal lobes distinctly denticulated. 

 Tail not granular, keels more strongly denticulated. Hand with 

 upper surface smoother, more polished, less strongly crested; its 

 inner edge studded with much larger denticles. Pectiaal teeth 

 14-18 (6,2). 



6. Strikingly different from the male of P. longimanus, with 

 secondary sexual characters poorly developed; brachium a In tie 

 longer than humerus, but not or scarcely longer than carapace ; 

 hand not narrowed, its width equal or nearly equal to underhand 

 and considerably less than movable finger; inner edge of hand 

 shaped as in female, lightly convex, with large rounded lobe, not 

 straight and parallel to the outer surface as in P. longimanus. 



Measurements in mm. (specimens from Rangoon). — $. Total 

 length 128, carapace 18, tail 67, humerus 14, brachium 16, under- 

 hand 1."), movable finger 20, width of hand 14. 



6 . Total length 111, carapace 16*5, tail 62, humerus 14, 

 brachium 15, underhand 14, movable finger 18, width of hand 

 12-5. 



Large specimens of this species reach a length of 180 mm. 



Loc. * Burma : Rangoon (Oates) and Mergui (Anderson). Siam ; 

 Singapore. 



The following species no doubt belongs to this genus ; but is 

 not recognizable: — 



Scorpio leioderma, Dufour, Mini. pris. -(«'. Set. Paris, xiv, p. 571, 

 1856. 



Colour subfuscous, with paler legs. Very smooth ; carapace 

 with eight eyes, emarginate and bilobed ; hands very wide, rough ; 

 caudal segments granular. Pectinal teeth 13. Length 4 inches 

 (french)= 108 millim. 



Loc. Malabar. 



* There are a couple of specimens in the British Museum labelled " Bengal." 

 This Locality, however, requires verification, 



u 



