RODENTIA—SCIURINAE—ARCTOMYS FLAVIVENTER. 343 
List of specimens. 
5 S Measurements. 
e134 |¢ i Wh Whence ob- | Nature of speci-| 3 |e wil Se Se ee SS) Sls 
2 Ee = Fpl anectéa. Saal. F ee > = 3 z Ese es 8 3 2 = fel . Da 
au | 3 ole lot] o (Pee 8) FB] SB RalFulss} o 
ero! lined slalom o (fo SS/E 1S beolscign| Ss 
eae a z\2\8 |2 e's |SiSE EE le 
o {oO D 2/24 | 24 | & |e/E im fa & ie 
1G31 |.2..selecceee Middleboro’, Mass..|..... Capon J. W. P. Jenks...| SKin 2... ceccccleve |reeclecca|svceee|ecee ae sece|accclaves|oust|suss| seas 
Essex co., N. Y...+ ..| Dr. 8. E. Hale ...|...do... o0e|secclecee|scccecleces |eeeelenes|ooee (3.462.353) coe] ine 
os|es'ewee|ncvs|esce|shecleces|acee |eeee 
bpeiden fe seahutsa 3.472.46| .81 
aleoeesclevee|aees|icee|seesistociaeaol) sealeae. 
BASO) Pees Boo ocsed aes Jeves|oce» +++ 3,632.31 +85) .c00 
847 | 1905 3 aa aain dO .....0000..| Aug. 25, 1855 fe 1.67/3.00/3.60) 14.50 4.75 6.75 2.33)3.043.19/2.19 64/109 
854 | 1910 fol eeeeee dO .ose0e0-02.| Sept. 7, 1855 |.... 1,50)2,10 3.50) 14,005.08, 7.08 2.42)3.14 3,272.00] .60/1.13 
she kay GO4:|seees0|/Carlisle, Paco. coe:|siecaianescesne FOCCeE|| aaa fe clei GOs 
1150 | 2038 |.-.... Racine, Wis ....... 1855 3,702.29) .78) 
iC. aa Pe West Northfield, Ill.| June .... .... ea heed aoe 
347 | 1261 |-.-..- Western Missouri..| June, 1854... oe 4 102.61 82 
wecces| 788 |eoroee Carlisle, Pa eeeeeee 3.782.40) .79 
Sesses BOT |eweee |eeeee dO wel encccecccccce- [eee | a vasl sides fees 
seceee| 167! O | Racine, Wis....0.s|eccceae coccees P. R. Hoy .....-- 00 0dO secccecces beaslnecalleacs 3.00 2.06 
eee | 2008 |e nsuclleaesse do Sel beesstisweciewe)|seccllO)s) ‘assicciceea|seaUOlucecicesaes|=s==|=0a5]/ans= 3.60) 79 
1 To end of outstretched hind legs, 20 inches, 2 To end of outstretched hind legs, 18 inches ; longest fore claw, .60; hind claw, .42. 
ARCTOMYS FLAVIVENTER, Bachman. 
Yellow-Footed Marmot. 
Arctomys flaviventer, Aup. & Bacu. Pr. A. N. Se. Phila. I, 1841.—Is. J. A. N. Se. Phila. VIII, m, 1842, 309.—In. 
N. Am. Quad. III, 1853, 160; pl. cxxxiv. 
Waener, in Wiegmann’s Archiv, 1843, II, 45. 
Sp. Cu.—Size of common woodchuck. Above, yellowish brown, somewhat grizzled with gray. Under parts of body and 
tail, and the legs all round, inside and out, reddish chestnut. 
A skin from the Black Hills, obtained by Dr. Hayden, is of very large size, The under parts, 
with the legs all round, are uniform chestnut brown, or dark chestnut, to the roots of the hairs. 
The upper parts are rusty yellowish, except in the middle portion of the lumbar region, where 
they are paler, and grizzled somewhat with dark brown, owing to a subterminal annulation of 
this color near the tips of the long hairs. The top of the head is uniform dark brown, nearly 
black ; the top and sides of the muzzle are reddish; the under part of the chin whitish. The 
tail is colored much like the belly; the hairs becoming dark brownish towards the roots. 
Length of skin, stretched, 22 inches; tail vertebree, 8; with the hairs, 10. 
The feet are wanting in part, or else so much mutilated as not to admit of a satisfactory 
description. The skull of this animal has fortunately been preserved in good condition, and 
presents some very characteristic features, as compared with that of A. monax. The muzzle is 
remarkably short and broad, owing to the extent to which the intermaxillaries enter into its 
upper surface. This is connected with a much greater proportional size of the upper incisors, 
which require more space for their accommodation. There is a more than usual depression or 
concavity on the frontal bone between the orbits. The upper molars again are rather smaller 
