RESULTS FROM THE MAMMAL SURVEY. 



225 



21 species and subspecies, of which we have had occasion 

 to describe no less than 11 as new, besides two from other 

 sources. For this really splendid result Science has to thank 

 the efforts of the Bombaj^ Natural Histor}^ Society, to whom also 

 the National Collection is indebted for the donation of so complete 

 a series of the specimens as fully to illustrate the conclusions we 

 have come to. And in this invaluable donation there are included 

 all the types of the new forms described. 



Taking the collection of squirrels as a whole, one of its most 

 striking features is its indication of the sharp line of demarcation 

 which the Eiver Chindwin forms to the eastward or westward 

 extension of the different species. With the exception of Ratufa 

 gigantea, occurring near the source, where it may have spread 

 round, and a small and perhaps native — caused irruption of Tooneutes 

 loJcroides across the river at Homalin, no species or subspecies 

 occurs on both banks of the river. Indeed the species on the two 

 sides are generally referable to different groups, thus indicating that 

 the separation has been of long standing, long enough for the 

 groups on each bank to have respective^ evolved within themselves 

 the rich series of subspecies found in succession from North to 

 South. 



The following table indicates the different species and subspecies 

 as they occur down the two sides of the river : — 



Hkamti 



N. Lat. 26° 5'. 



•Kauktaung 

 Minsin 

 Tamanthe 

 Maungkan 



Homalin 



Pyaungbyin 

 Tatkon (W)- 

 Kinclat (E). 



Kin (W)- 

 Yin (E). 



West Bank. 



Ratufa gigantea 

 Callosciurus erythrceus cro- 



talms. 

 Tomeutes lokroides 



C. ergtlir (BUS nag arum 

 T. lokroides 



C. erythrceus nagarum 

 T. loTcroides 



R. gigantea lutrina 

 C. erytJircsus kinneari 

 T. lokroides 

 Dremmnys macmillani 

 T. lokroides mearsi 



East Bank. 



Ratufa gigantea. 



Callosciurus sladeni shortridgei. 



Tomeutes similis oioensi. 

 Dremomys rujigenis opimus. 

 Tamiojjs macclellandii. 

 C. sladeni shortridgei-fryanus. 

 T. similis otvensi. 

 C. sladeni fryanus. 

 'C. similis o%oensi. 

 C. sladeni careyi. 

 T. macclellandii, 

 R. gigantea. 

 C. sladeni haringtoni. 

 T. onacclellandii. 

 C. sladeni haringtoni . 

 T. lokroides. 

 T. macclellandii. 

 C. sladeni onillardi. 



C. sladeni sladeni. 



D. rujigenis adamsoni. 



Ratufa fellii. 



C. sladeni rube.r. 



C. pygerythrus janetta. 



