152 



CRUSTACEANS OF THE 



N°^ 1 and 2 Ketoengau river; N°^ 3- 

 at Nanga Raoen ; N''. 7 Sintang. 



6 Mandai river 



Palaemon (Macrobrachium) callirrhoë , n. sp. 



Fig. 



Three males from the Mandai river at Nanga Raoen and 

 one young male from the Ketoengau river. 



Though no ova-bearing females of this apparently new 

 species have been collected, I suppose nevertheless that 

 the male specimens are adult or nearly fully developed 

 and that Fal. {Macrobr.) callirrhoë belongs , like the two 

 preceding, to the species of small size. The largest 

 specimen measures only 43 mm. from the apex of the 

 rostrum to the extremity of the telson. 



The rostrum of all four specimens extends to the ex- 

 tremity of the anten 11 al scales and is slightly 



Notes from the Leyden ^Museum , Vol. XX. 



