RODENT1A ARVICOL1NAE ARVICOLA CINNAMONEA. 



541 



anterior pair of re-entrant angles in the anterior lower molar come so close together as to cut off 

 the isthmus of dentine ; the result of this is to divide the anterior indented lobe into two spaces, 

 an anterior sub-quadrangular and a posterior sub-triangular, and extending across the tooth. 

 This can scarcely be considered an exception to the characteristics given above, however. 



This, the most common arvicola about West Northfield, varies a good deal in its characters, 

 being sometimes almost black above ; sometimes the dull faded cinnamon of the belly is 

 brighter, sometimes paler ; occasionally almost absent, leaving the basal plumbeous color most 

 distinct. 



The description I have given of the species differs somewhat from that of Major Leconte ; but 

 his original (belonging to the collection of the Smithsonian Institution) is one of the few in 

 which the cinnamon tips of the hairs are inappreciable. There can be no question of their 

 being the same. 



List of specimens. 



ARVICOLA (PEDOMYS) CINNAMONS A, Baird. 



Sp. CH. Size of A. austerus, 4.50 inches. Skull 1.12. Head narrow. Fur coarse, .4 of an inch above. Ears small ; well 

 furred ; half as long as the hind feet. Feet rather large ; hinder ones hairy beneath for half their length. Tail vertebra one- 

 third the head and body ; not twice as long as hind feet. 



Above and on the sides, yellowish brown, mixed finely with black, but not obscured by it ; less black on the sides. A wash ot 

 dark rufous along the back. Belly pale cinnamon. No distinct line of demarcation between the colors. Fur above darker 

 plumbeous, just before the brown tips. Tail strongly bicolor, colored like the corresponding regions of ths body; darkest at 

 the tip. 



Skull very narrow. Length to width as 100 to 50. Muzzle very long. Line of molars scarcely one-fifth as long as the head. 



This species is of rather large size, and stout in proportion. The fur is rather coarse and 

 stiff, especially the longer bristly hairs ; it measures about four-tenths of an inch above. The 

 ears are small, longer than broad (.4 inch) ; rather thickly covered with long hairs on both 

 sides so as to hide the margin ; the antitragus is of considerable development. The feet are 

 large and stout ; the thumb of the fore foot rudimentary or obsolete, enveloped or encircled in 



