PAT, \MN 1 I 8, 



35 



-. Humerus of chela coarsely granular on the 



underside at base ; 5th caudal segment [p. 80. 



not shorter than carapace P. stcammerdami, 



: . Humerus smooth below, or with only a few 

 granules ; 5th caudal segment much 

 shorter than carapace. 

 a 3 . Tarsal lobes armed eacli with 3 spines, 1 [p. 90, 



at the apex above and 2 below P. latimanus, 



b\ Tarsal lobes armed with 2 spines each, the 

 apex not spined, tipped with bristles. 

 a*. Lower side of vesicle perfectly smooth 



and polished, hairy and punctured . . P. finrus, p. 91. 

 //. Vesicle furnished below with at least 

 four rows of sharp tubercles. 

 <i' . Inner edge of hand not beset with 

 sharp tooth-like tubercles, crested 

 at base of finger ; upper surface with [p. 90. 



four low longitudinal crests P- gravimawws, 



b\ Inner edge of hand studded with 



sharp denticles, not crested at base 



of finger ; tubercles of the dorsal 



side not running into four distinct 



longitudinal crests. 



if: Outer portion of upper surface of 



hand defined above by a distinct 



but irregular ridge or erest. 



a 1 . Legs reddish yellow P. fidvipes, p. 87. 



b 1 . Legs deep blackish brown .... P. wroughtoni, 

 b*. Outer portion of upper side of hand [p. 89. 



not defined above by a longitudinal 

 ridge. 

 a . Length of adult only about 



75 mm. ; legs reddish yellow as [p. 92. 



mfulvipes P. x-anthopw, 



J*. Length of adult not less than 

 100 mm. ; legs coloured like 

 trunk, generally nearly black. 

 a 9 . Hand exceedingly smooth 

 above ; terga with three pos- 

 terior tubercles P. tcaber, p. 98 



£\ Hand rugose or tubercular: 

 teiga not tubercular. 

 a 10 . Hands orange-yellow; rest 



of chela?, body and legs hhuk. ]' barieri, p. !'•">. 

 i'°. Hands much the same colour 

 a- rest of chela; 

 a 11 . Hands narrow, smooth, 



covered above with sculp- [p. 94. 



turing of reticulated ridges. /'. bengalensis, 

 b x l . Hands broad, ci >\ ered above 



with large tubercle- or 

 Coarsely reticulated 

 a 1 -. Last abdominal sternum 



without four low crests, 



densely punctured; basal 



portion of pecten broad, 



its angle lees obtuse .... P. phipsoni,^. 



