130 Bangs New Field Mouse from Newfoundland. 



Description. 



Type. No. 1104 J ad. Coll. of E. A. and O. Bangs. Boston, Mass. 

 From Codroy, Newfoundland, Nov. 27, 1893, Ernest Doane, collector. 

 Total length, 187 mm.; tail, 54 mm.; hind foot, 24 mm.; ear, 12 mm. 

 (These measurements taken in flesh by the collector. ) 



Above: Brown, of a color between raw umber and Prout's brown, becom 

 ing gradually lighter on the sides, with a slight sprinkling of shining black- 

 tipped hairs on the back. 



Under parts : Grey No. 9,* with an indistinct line of darker (about the 

 color of the sides) running up the middle of the belly nearly to the front 

 legs. 



There is a well defined nose-patch extending from the nose to and around 

 the roots of the whiskers, of a dull tawny color. The base of the hair is 

 everywhere blackish slate. The tail is distinctly bicolored above, black ; 

 below, grey No. 10,* and quite hairy. 



Cranial and dental characters: The skull of Arvicola temmovx is broad and 

 short, and has the flaring zygoma and great interorbital constriction of A. 

 xanthognathus. The rostral part is also narrow as in that species. The 

 pattern of enamel folding is, on the other hand, more like that of A. 

 riparius, with the difference that the last loop of the posterior upper molar 

 is trifoliate, as against the cresent shape of riparius There are one or two 

 other trifling differences in the enamel folding that can be better seen by a 

 critical examination of the accompanying drawing.! 



This Arvicola seems to occupy an intermediate position be 

 tween the xanthognathus and riparius groups. The indication of 

 nose-patches can occasionally be found in individuals of A. rip- 

 arius, but I never have seen a series from any one place that 

 shows any tendency to this marking, while every one of my series 

 of sixty-three A. terrsenovae has a distinct, though dark colored 

 and not conspicuous nose-patch. 



The rather peculiar marking of the under parts is constant 

 through the entire series ; indeed, I have seldom seen a series of 

 mammals more uniform in every respect. 



Mr. Doane found this field mouse common everwhere about 

 Codroy, where he spent the winter, and where all my specimens 

 came from. 



*Ridgway's Nomenclature of colors, Plate II. 



tExcellent figures of the skulls of A. riparius, A. xanthognathus, and A. 

 chrotorrhinus can be found in " On a Collection of Small Mammals from the 

 New Hampshire Mountains, by Gen-it S. Miller, Jr.", in the Proceedings of 

 the Boston Society of Natural History, Vol. XXXVI, Plate 3.' 



