248 ZOOLOGY OF THE FAR EAST. 



and 44 mm. in length; the chela is 64 mm. in length with very widely gaping fingers. 

 Adults are invariably of a rich reddish crimson colour, stains of which not infre- 

 quently occur on the sternum. The six punctae described by Manchester in his 

 account of P. sexdentatum are visible in most of the specimens and four of them are 

 often rendered conspicuous by their colouration, which is pale yellow and contrasts 

 sharply with that of the general surface. Young individuals are of a dull olive brown 

 tint. 



There can be little doubt that the synonymy given above is correct. P. germaini 

 is recorded by Miss Rathbun from many locahties in French Indo- China and Siam 

 and also from the islands off the west coast of the Malay Peninsula and (doubtfully 

 perhaps) from Japan. It is evidently the common river crab of the country round 

 the Tale Sap, from which it was recorded by Manchester under the name Potamon 

 {Paratelphusa) sinense. 



Subgenus Liotelphusa, Alcock. 



1910. Liotelphusa, Alcock, Cat. Indian Decap. Crust., I, fasc. ii, p. 109. 



Paratelphusa (Liotelphusa) kuhli (de Man). 



1883. Geothelphusa Kuhlii, de Man, Notes Leyden Mus., V, p. 154. 



1892. Geotelphusa Kuhlii, de Man, in Weber's Zool. Ergebn Reise. Nied. Ost-Ind., II, p. 288, 



pi. XV, figs. 3a-c, pi. xvi, fig. 3. 

 1905. Potamon (Geothelphusa) kuhlii, Rathbun, Nouv. Arch. Mus. Paris (4), VII, p. 208. 



Other references are suppHed by Miss Rathbun. Hitherto the species has 

 invariably been referred to Geotelphusa ; in general appearance it bears a very close 

 resemblance to Potamon {Geotelphusa) dehaani (White), and it has been compared in 

 detail with that species by de Man. Examination of the mandibular palp shows, 

 however, that in spite their external similarity there is no close affinity between the 

 two forms. In P. (G.) dehaani the terminal segment of the palp is simple, the species 

 belonging to Alcock' s subfamily Potamoninae. In ''Geotelphusa" kuhli the terminal 

 segment is formed of two lobes which embrace the incisor-process of the man- 

 dible ; the species will therefore find a place in the subfamily Gecarcinucinae 

 of Alcock' s classification and must be referred to the genus Paratelphusa and the 

 subgenus Liotelphusa. It is by no means distantly related to P. [L.) levis (Wood- 

 Mason) . 



Paratelphusa kuhli is represented in the collection by a series of more than thirty 

 specimens of all ages. In her key to the species of the subgenus Geotelphusa, Miss 

 Rathbun lays stress on the presence in this species of a rudimentary epibranchial 

 tooth. The use of this character is, however, likely to prove misleading, for the tooth 

 is entirely absent in a number of the specimens in the present collection, while in all 

 the others only the faintest traces of its presence can be detected. 



The specimens were found by the late Dr. W. C. Hossack in the Government 

 Quinine Gardens at Tijnproean in Java at an altitude of 5600 ft. The species is only 

 known from Java. 



