196 NEW SPECIES OF MICE — ALLEN. 



yellowish tinge below plainly seen in the others, which, however, 1 

 suspect may be due to soiling. 



In the type the teeth are much worn, indicating full maturity. 



This form is evidently a member of the leucoims group of Vesper- 

 mice, having the same pattern of coloration as regards the extension 

 of the dark color of the dorsal surface upon the limbs. The relative 

 length of the tail to the length of the head and body is about the same 

 as in Jeucopus proper, the tail being longer than in the sonoriensis group, 

 although the color is not much different from occasional specimens of 

 what is usually known as sonoriensis. It has, however, a longer hind 

 foot, and the facial portion of the skull is longer and narrower than in 

 average specimens of either leucopus or sonoriensis. 



The specimens here under notice were provisionally referred by Dr. 

 Cones to his S. melanophrys, in his supplementary note to his account 

 of that species in "Monographs of North American Eodentia," p. 305, 

 as fully explained above. 



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