Fes., 1912. Mammats oF ILLINOIS AND Wisconsin — Cory. 225 
and it often does considerable damage in the garden, as it is fond of 
vegetables such as carrots and potatoes. In localities where it is at 
all common it is destructive to fruit trees. Kennicott states that while 
their food consists largely of roots of grass and other plants, he has 
found acorns and hazel-nuts in their burrows. 
The exact range of the Mole Mouse in Illinois is uncertain. Bailey 
records it from West Northfield, Cook Co., and from Warsaw, Hancock 
Co. Kennicott states it was common in northern Illinois and southern 
Wisconsin, but the latter statement at least is questionable, as so far 
as I am aware there is no actual record of its having been taken in 
Wisconsin. Wood failed to find it in Champaign Co. and doubts that 
it is found there. The most northern record I have been able to find 
of its occurrence in Indiana is that given by Evermann and Butler from 
Wabash Co.* (J. ¢., p. 127.) It is common, however, in southern 
Illinois. The Field Museum collection contains specimens from John- 
son, Alexander and Hardin counties. 
Specimens examined from Illinois: 
Illinois — Olive Branch, Alexander Co., 11; Rosiclare, Hardin Co.,1; 
Reevesville, Johnson Co., 2= 14. 
Genus FIBER Cuvier. 
Fiber Cuvier, Tabl. Elém. de Hist. Nat. des Anim., 1798, p. 141. (De- 
scribed in 1798, but not named until 1800) Jb., Legons d’Anat. 
Comp., I, 1800, tab I. Type Castor zibethicus Linn. 
Body short and thickly furred; tail bare and vertically compressed 
(width decidedly less than height); toes of hind feet partly webbed; 
molars or grinding teeth with pronged roots; lower incisors with roots 
on outside of molars; auditory meatus with protruding edge. 
I- 
Dental formula: I. Be o< a = 
[2 ° 
Fiber zibethicus (Lrinv.). 
MusKRAT. 
Castor zibethicus LINN&US, Syst. Nat., XII ed., I, 1766, p. 79. 
Fiber zibethicus LAPHAM, Trans. Wis. State Agr. Soc., II, 1852 (1853), p. 340 (Wis- 
consin). KENNicotT, Trans. Ill. State Agr. Soc., I, 1853-54 (1855), DP. 579 
(Cook Co., Illinois). Jb., Agr. Rept. for 1856, U. S. Patent Office Rept., 1857, 
Pp. 105 (Illinois), Muves, Rept. Geol. Surv. Mich., I, 1860 (1861), p. 221 (Mich- 
*Given as pinetorum by Evermann & Butler, but which I assume to be this 
Tace, 
