296 MICROTIN^ 



region shown by the temporal ridges and the anterior portions 

 of the squamosals, characters which betoken increased develop- 

 ment of the anterior portions of the temporal muscles; and 

 by the greater size and complexity of the m^. In the con- 

 fluence of the dentinal spaces of the teeth most of the species agree 

 with Eothenomys ; but one form {A. c. tarquinius) shows in this 

 respect a tendency towards the condition characteristic of 

 Evotomys rufocanus. 



Species. — Five forms, all very closely related structurally 

 and geographically, are now known, and they are currently 

 referred to three species; viz., A. chinensis and A. wardi which 

 are large forms, and A. custos which is smaller. The differences 

 between these species, though apparently constant, are of little 

 moment, and not improbably all, at some future date, will be re- 

 garded as subspecies of A. chinensis. It is to be hoped that efforts 

 will be made to collect further material ; for although the series 

 now available are tolerably long they include very few if any 

 specimens which I should be inclined to regard as fully developed. 



Key to the species and S2ibspecies of Anteliomys : — 



A. Tail about two-thirds the length of the head and body. Ears 



relatively large. Colour darker. 



a. Skull with large, lofty and convex braincase; auditory 



bullae large. 

 a^. Cheek-teeth normal; upper molars with confluent 

 dentinal spaces; m* complex with five inner saUent 



angles A. chinensis chinensis Thomas. I 



W. Sze-chwan. i 

 h^. Cheek-teeth modified ; upper molars with dentinal spaces 

 substantially closed ; m^ simpler, with four inner salient 



angles A. c. tarquinius Thomas. 



W. Sze-chwan. 



b. Skull with braincase small, depressed and flattened above. 



Auditory buUse very small A. wardi Thomas. 



N.W. Yunnan. 



B. Tail less than half the length of the head and body. Ears 



shorter. Colour paler. 



a. Upper parts less rufous, under surface browner. Hands and 



feet greyish white A. custos custos Thomas. 



Mekong-Yangtze Divide. 



b. Upper parts redder, under-surface greyer. Hands and feet 



dusky A. c. rubelius G. M. Allen. 



Li-chiang Range.] 



1. Anteliomys chinensis Thomas. 

 (Synonymy under subspecies.) 



Range. — Mountains of Western Sze-chwan. 



Characters. — Size large ; hind-foot 20-23 mm. ; condylo- 

 basal length 28 mm. Fur soft and dense, about 12 mm. long on 

 back. 



General colour dark ; upper surface dark brown, near " Prouts 



