250 Journal of the Asiatic Society of Bengal. [June, 1913. 
1893. Telphusa fluviatilis, Barrois, Rév. biol. Nord France, V, 
125 
1904. Potumon potamios, Rathbun, Mem. Mus. Hist. Nat. 
(Paris), (4), VI, p. 257. 
the crab accepted by Miss Rathbun as Potamon potamios prob- 
5 is often used some- 
: e have no reason to 
think that the species, as defined by Miss Rathbun, has been 
found within the limits of Syria proper, for Djerach, the only 
‘Syrian ’ locality from which P. potamios is definitely recorded, 
lies near the R. Jabbok in Eastern Palestine considerably south 
of the Lake of Tiberias. Both Miss Rathbun (loc. cit.) and Col. 
opportunity to discuss it in some detail, having good series of 
specimens of most of the forms before us. 
group, as we conceive it, consists of only two species, 
otamon potamios (Olivier), Rathbun, and P. fluviatile (or edule) 
(Latreille), the latter being divided into five local races: 
fluviatile (s.8.); setiger, Rathbun; ibericum, Marschall de Bieber- 
stein; gedrosianum, Aleock, and monticola, Wood-Mason. The 
only one of these forms of which we have not seen specimens is 
monticola from the followinc key, but have figured one of the 
pd som also the only specimen from the Khasi Hills in plate 
a. gs. 6 and 5, respectively. It will be noticed.in these 
‘ eee that the eyes are considerably larger and _ stouter 
than jn P. potamios or in any of the western races of P.fluviatile. 
1 Ree. Ind. Mus., V, p. 258 (1910). 
‘ 
