the River Supi'naam, Demerara. 185 



phalanx 20, second phalanx 20 ; lower leg and hind foot 

 (c. n.) 43. 



JSkull : greatest length 28*3; condylo-basal length 24'7 ; 

 zygomatic breadth li"?; mastoid breadth l-l'S ; palatal 

 length lo"3 ; front of canine to back of m' 10*5. Breadth 

 between outer corners of ni^ 9*4. 



Ti/pe. B.M. no. 10.5. 4. 5. 



Tliis wouhl a|)pcar to be the Guianan representative of 

 2\ sylvicola^ but material is not at present available to 

 elucidate the relative positions of the various forms described. 



5. Nasua vitlata, Tschudi. 



!Male and two females. 



Of this rare and peculiar species I only know of two 

 previous specimens, the type in the Berlin Museum and an 

 example whicii lived in the Zoological Gardens some years 

 ago and is now mounted in the Hon. W. Rothschild's Museum 

 at Tring. 



The male is coloured very much as described by Tschudi, 

 but the females are blackish throughout on the upper surface 

 and sides, though the bases of the hairs and the whole under 

 surface are ocliraceous or tawny as in the male. Whether 

 this difference is individual or really sexual more material 

 will be needed to decide. 



One female. 



One. 



Four. 



6. Lutra niitiSf Thos. 



7. Tayra larhara, L. 

 8. Sciurus cestua7iSj L. 



9. Nectomys squamipes melanius, subsp. n, 



Three. 



»Size and general characters as in true squamipes^ the 

 Brazilian water-rat. Colour, however, distinctly darker, the 

 greater part of the dorsal area blackish brown, almost witliout 

 lighter tickings ; sides and hips dark broccoli-brown ; under 

 surface soiled greyish with butfy tips. 



ykull rather smaller and molar series shorter than in 

 squamipes. Palatal foramina with a tendency to a median 

 constriction. 



Dimensions of the type (measured in the flesh) : — 



Head and body 244 mm. ; tail 2U0; liind foot (s. u.) 46; 

 ear 24. 



