286 MICROTIN^ 



lb. Eothenomys melanogaster cachinus Thomas. 

 1921. Microtus (Eothenomys) cachinus Thomas, J. Bombay N.H.S., 



27, p. 504. 

 1923. Eothenomys melanogaster cachinus Hinton, Ann. Mag. N.H., 



[9], 11, p. 149. 



Type.—YiM., No. 20.8.7.14; adult female, collected June 29, 

 1919, by Mr. F. Kingdon Ward, and presented by the Bombay 

 Natural History Society. 



Tyjpe locality. — Imaw Bum, Kachin Province, Northern Burma. 

 Altitude 9000 feet. 



Range. — Known only from the type locality. 



Characters. — A bright-coloured form, with small auditory 

 bullae, heavy cheek-teeth and complex m^. 



Size rather large (hind-foot 19 mm. ; condylo-basal length of 

 skull 25-9 mm.). 



Colour as in E. m. eleusis or slightly paler. Ears and feet as 

 in that form, but tail rather longer. 



Skull larger and heavier than in E. m. eleusis; interorbital 

 region longer and more parallel-sided. Anterior palatal foramina 

 narrowed in their posterior third. Auditory hullEO decidedly 

 smaller than in E. in. eleusis, in antero-posterior diameter 

 (parallel with the middle line of the skull) 6 instead of 6-7 mm. 



Cheek-teeth markedly heavier than in eleusis, and m^ slightly 

 more complex than in latter form ; m^ with four, m^ with three 

 salient angles on inner side; m^ with four inner and four outer 

 salient angles. 



For external and cranial measurements, see tables at end of 

 volume. 



Ic. Eothenomys melanogaster eleusis Thomas. 

 1911. Microtus {Eothenomys) melanogaster eleusis Thomas, Abstr. 



P.Z.S., 1911, p. 50; P.'Z.S., 1912, p. 139. 

 1923. Eothenomys melanogaster eleusis Hinton, Ann. Mag. N.H., [9], 



11, p. 149. 



T?/pe.— B.M., No. 11.9.8.111; adult male, collected March 13, 

 1911, by Malcolm Anderson; presented by the Duke of Bedford. 



Type locality. — East of Chao-tung-fu, Northern Yunnan. 

 Altitude 5800 feet. 



Range. — Known only from the type locality. 



Characters. — Size normal (hind-foot 19 mm. ; condylo-basal 

 length of skull to 26 mm.). Distinguished from E. m. melanogaster 

 by its longer tail and more complex m^. 



Colour dark nearly as in E. m.. melanogaster, but back averaging 

 rather more greyish-brown. Tail decidedly longer, usually 46- 

 48 mm. instead of 34-36 mm., but an isolated example of each 

 of the two forms in each case measures 43 mm. 



Skull nearly as in E. m. melanogaster, the auditory bullae being 



