450 



U. S. P. R. R. EXP. AND SURVEYS ZOOLOGY GENERAL REPORT. 



caruncle is discernible. The ears are large and broad, rather densely coated with longish hairs, 

 which, in this case, as well as on the rest of the body, are longer than usual in Hesperomys. 

 The base of the ear is concealed by the long hairs on the cheeks. The tail is nearly as long as 

 the body, and the hairs on it sufficiently dense to obscure the muroid scaly rings. The fore 

 foot is too much distorted to show the comparative length of the fingers. On the hind foot, the 

 central three toes are longest and nearly equal. The fifth claw reaches to the base of the fourth. 

 The sole is hairy to near the end of the metatarsus. 



The predominant color above is a mixed brown and pale yellowish gray ; beneath, dull 

 whitish ; on the flanks and the outside of the ear, pale yellowish brown. Nowhere any tinge 

 of rufous. The hairs above are lead color at their base, then dull grayish yellow, and tipped 

 with dusky. On the sides, the yellowish is brighter and the dusky tips wanting, in great 

 measure. The tail is dusky above, whitish beneath and on the sides, the difference of color 

 scarcely discernible. The feet also are whitish. 



General dimensions. 



This species appears to differ from the It. humilis in longer tail, shorter hind feet, and the 

 absence of any rufous on the body. The imperfect condition of the specimen prevents more 

 minute details. The ears, however, are smaller, the auricle thicker, and covered with longer 

 and coarser hairs than in Hesperomys, more as in Arvicola. The under parts are of a much 

 purer white. 



List of specimens. 



