140 Recoyds of the Indian Museum. [Vol. XXIV, 



Key to the species of the subgenus Periclimenes. 



)ngica 

 son). 



A. Supra-orbital spine absent. 



B. Antennal spine absent ; R. 7-S : 1-2 ... longicaudatits (Stimp- 



R '. Antennal spine present. 



C. Third abdominal somite produced backwards 

 over fourth in the form of a large compressed 

 tooth; R. 9-11 : 2 ... ... ... aesopins (Hate). 



C. Third abdominal somite little produced pos- 

 teriorly. 

 D. Fingers of chela of first leg unarmed. 



E. I .a teral process of antennular peduncle of 

 normal length, not reaching beyond middle 

 of basal segment. 



F. Second leg with carpus more than one- 

 third length of palm. 



G. One or more upper rostral teeth situ- 

 ated on carapace behind posterior limit 

 of orbit. 



//. Dactyl us of last three legs slender, 

 at least ^ times as long as broad. 

 J. Posterior dorsal tooth of rostrum 

 separated from next by a wide in- 

 terval ; carpus of second leg much 

 more than half as long as palm. 

 K. Upper border of rostrum very 

 strongly arched, with ventral 

 teeth placed close to apex below 

 or in advance of foremost dorsal , 

 tooth ; fingers of secor.d leg as 

 long as palm. 

 R. 6-8 : 1-2 ... ... infraspinis (Rathbun 



R. 9-11 : 1-3 ... ... indicus (Kemp). 



K' . I'pper borcler of rostrum only 

 a little convex, with ventral teeth 

 placed behind foremost of dor- 

 sal series ; ringers of second leg 

 usually shorter than palm ; R. 

 7-10 : [-2 ... ... ubscurits, sp. now. 



y . Posterior dorsal tooth of rostrum 

 not separated from second by a 

 wider interval than that between 

 second uul third , carpus of second 

 leg about half as long as palm. 

 K. Abdomen transversely banded 

 and blotched with red ; R. 8-10 : 

 2~4 ... ... ... scriptus (Risso). 



A''. Abdomen longitudinally striped 



with violet; R. 8 : 4 ... amethysteits (Risso). 



H' . Dactyl us of last three legs stout, 

 less than 4 times as long as broad 

 [posterior dorsal tooth of rostrum 

 not separated from second by a wider 

 interval than that between second and 

 third] ; R. 9 : 2 ... .., inipar, sp. now 



(/'. No teeth of upper rostral series situ- 

 ated on carapace behind orbit. 

 //. Rostrum deep, downcurved ; apex 

 of antennal scale broadly rounded ; 

 R. 6:1 ... ... parvus Borr. 



//'. Rostrum shallow, straight ; apex 

 of antennal scale sharply rounded ; 

 R. 6 : 1 ... ... ... incertus Borr. 



