BOTHENOMYS 285 



a. Small (condylo-basal length to 24 mm.); wi^ normal, with 



three inner salient angles; w? complex, with four salient 



angles on each side E. olitor Thomas. 



Chao-tung-fu, Yunnan. 



b. Large (condylo-basal length to 27-5 mm.) ; m' with the third 



inner salient angle vestigial ; m^ with its first outer infold 

 shallow {Alticola-like), and with the fourth inner and fourth 

 outer saUent angles vestigial. Colour bright. 



E. -prodilor Hinton. 



Li-chiang Range. 



E. honzo from Fuchow, described by Cabrera (Bol. Real Soc. Espan. 



Hist. Nat., 22, 1922, p. 168) is probably a synonym of E. m. colurnus. 



1. Eothenomys melanogaster Milne-Edwardes. 

 (Synonymy under subspecies.) 



Range. — Southern China and Northern Yunnan, westwards 

 into Northern Burma and Assam. 



Characters. — Essential characters as described under the 

 genus ; colour and size varying with the subspecies. 



Skull normal, not especially narrow, massive, or strongly 

 ridged. Anterior upper cheek-teeth, m^ and irfi, always complex, 

 m^ with four and dv^ with three well-developed salient angles on 

 the inner side ; m^ with three or four salient angles on each side 

 according to the subspecies. Auditory bullae and molar teeth 

 differing in different forms, large bullfe being correlated with 

 small molars, and large molars with small bullae. 



Geographical differentiation. — Nine subspecies of E. melano- 

 gaster are at present recognized. 



la. Eothenomys melanogaster melanogaster Milne-Edwardes. 



1871. Arvicola mdanogaslcr IMilne-Edwardes, Nouv. Arch. Mus., 7, 



Bull. p. 93 ; Rech. Mamm., p. 284, pis. xliv. 

 1891. Microlus melanogaster Blanford, Fauna British India, Mammaha, 



p. 434. 

 1896. Microlus {Eothenomys) melanogaster Miller, N. Amer. Fauna, 



No. 12, p. 46. 

 1923. E[olhe)iomi/s] m[elanogaster] melanogaster Hinton, Ann. Mag. 



N.H., (9), 11, p. 149. 



Type. Paris Museum. 



Type locality. — Moupin, Western Sze-chwan, China. 



Characters. — Size normal, hind-foot 17 mm. ; condylo-basal 

 length to 25 mm. 



Colour very dark ; upper parts clove brown, very finely pep- 

 pered by the short tawny subterminal bands of the longer hairs ; 

 under surface blackish. Feet light brown. Tail obscurely bi- 

 coloured, dusky above, brownish white below. 



Skull normal, with relatively large auditory bullae and light 

 cheek-teeth ; m^ with three salient angles on each side. 



For external and cranial measurements, see tables at end of 

 volume. 



