2)7^ l\ccords of the Indian Museum. [Vol. Ill, 



of the antero-lateral borders are not so sharp. The merus of the 

 external maxiUipeds is longer. 



The abdomen of the adult male is even more decidedly hour- 

 glass-shaped than in P. sinensis, the fifth segment being a long 

 tapering joint, and the long sixth segment being narrower at its 

 proximal end than in P. sinensis. 



From Moung Sal, Makhok River : 13 males, 15 females. 



Subgenus Barytelphusa. 



(Type: Paratelphusa jacqucnwntii (Rathbun) = " Telphttsa 

 indica " of many authors.) 



Paratelphusa {Barytelphusa) lamcllifrons, sp. nov. 



Very closely related to " Telphusa indica," from which it may 

 be recognised by the following characters : — 



The carapace is longer, and the ends of the wings of the 

 cervical groove ' ' are broad , superficial and vague. 



The front is a very prominent, hardl^-deflexed lamella. 



The distance between the tip of the external orbital tooth and 

 the base of the epibranchial spine forms half the antero-lateral border 

 of the carapace. 



The epigastric portion of the continuous post-orbital crest is as 

 thin as the true post-orbital portion ; the outer end of the crest forms 

 a prominent, but undetached, lobe, and the edge of the whole crest 

 is elegantly crenulate. 



From Travancore : i adult female, i young female. 



Paratelphusa {Barytelphusa) edentula, Alcock. 



I have already mentioned this species as a variety of ' ' Potamon 

 lugubre." At that time, although I knew that the terminal joint 

 of the mandibular palp was bifurcate in ' ' Potamon lugubre ' ' 

 (= Telphusa lugub/is, Wood-Mason), I did not realize that the 

 mandible was going to be so destructive to the established nomencla- 

 ture, and that Telphusa lugtibris, Wood-Mason, belongs to the 

 present subgenus of Paratelphusa. 



Paratelphusa {Barytelphusa) nap^Ba, Alcock. 



This has also been mentioned as a species of Potamon allied to 

 " Potamon lugubre " (Wood-Mason). It is ver}- closel}' related 

 to Paratelphusa {Barytelphusa) lugubre (Wood-Mason). 



Paratelphusa {Barytelphusa) pulvinata, sp. nov. 



This species is distinguished from everything in the subgenus ( i ) 

 by the carapace, which is subcylindrical, with the cervical groove 

 running in a long and comparatively narrow loop, as in Gecarcinucus, 

 and (2) by the long, narrow, sixth abdominal segment of the adult 



