16 U. S. P. Re. R. EXP. AND SURVEYS——-ZOOLOGY—GENERAL REPORT. 
and scantily clothed with short stiff depressed hairs, which constitute a very small pencil at the 
end. The fur is very long and full, measuring three lines on the back. 
The upper parts are of a rather dark olive brown, with a hoary tinge, caused by penultimate 
bars of grayish on the hairs. The sides are paler, with a tinge of chestnut ; the under parts 
are of a yellow brownish white. The feet and under surface of the tail are white, with a dusky 
yellowish tinge. : 
The skull is moderately slender anteriorly. The dentition is >4+23+ ),—32. The 
upper anterior incisor has a second hook at the base, decidedly smaller, however, than the one 
in front of it forming the tip of the tooth and about equal to the third lateral tooth. The 
first two lateral teeth are of equal size, and decidedly larger than the fourth, which, however, 
is larger than the third. The teeth are all chestnut colored at the tips. 
Measurements of 630 (first four taken before skinning). 
Inches. Lines. 
{OOS CSCC YN Mr el 2 
INOSCsO TOO OR Talla ae eee ee ee a a ee oe 2 
Mailitcrend of yerteDie=—- = -<sees== sae eae eee 1 
PEI iGhWOy MeN Sees oes SSS Sea ooscosecoss 1 83 
CeDegra cl form spy US ee om mmm es lc | lel 3h 
Tierayricosray | (ste) ee es ey Se SAE Se Sot Sees e pees 5} 
Ska ilengthe-- sean ene seen ene ane eee eee eee cee 8 
SHeni Gli 5 8 5-9 Se ee See Ss see soomsoss Sse se soos 3x, 
Jee ORE ea eea ease Se. och Soe See osEcos| tea seeeanens 333 
WadthlofiuppersjaWeanscas eco oee saree ee ee eee | Soe areata es 24; 
Several specimens in alcohol agree essentially with the preceding description taken from a 
dried skin. In one or two the color of the back is a brighter chestnut than as described. 
There is considerable difference in the thickness of the tails at the base, and the swelling of the 
head ; these, however, are probably sexual characters, as they are most marked in the males. 
In most specimens, the terminal pencil of hairs of the tail is worn off to a stump, or else want- . 
ing, leaving the tip of the tail naked. In 1259 this pencil is, however, visible. 
Measurements from alcoholic specimens. 
Length ‘of head) o-oo nemn 0. 87 0. 86 0. 87 
Head and body-.--- = Sap agsemSanoceneseae 2. 21 2. 55 2.26 
Tail to end of vertebre_........-..------ 1. 67 1. 15+ 1.75 
Tail'to end of hairs..---..2- 22.2------5- 1. 67 1. 15+ 1.85 
Fore foot......--..-----------------=--- 0. 29 0. 28 0. 28 
anid POD tes dae eno etre ee ee 0. 50 0.49 0. 49 
LOIS oe ee SRR ce RE ROr Sens 2 Ree eee 0. 25° 0. 26 0. 25 
