26 U. Ss. P. R. R. EXP. AND SURVEYS—ZOOLOGY—GENERAL REPORT. 
white, with a slight tinge of brown ; the color well contrasted against the back. The feet and 
under surface of the tail are whitish; the upper surface of the tail like the back ; the entire 
tip dusky. The teeth are light chestnut at the point. ; 
The upper premolar teeth are imbricated anteriorly, and diminish from the first to the fourth 
with considerable regularity ; the difference between the third and second being much less 
appreciable than in S. coopert. , 
The weight of a specimen of this species, as given by Linsley, is 47 grains; that of number 
1696, however, of the accompanying table, amounted only to 37 grains. 
For the measurements of the skull of this species, see the table under the head of S. cooperi. 
There are some slight. variations from the above characteristics in different specimens. Thus, 
the tail is sometimes a little longer or shorter. The ear varies somewhat in size. Sometimes 
the chestnut of the back is of a browner or darker shade—a characteristic, probably, of the 
winter pelage. In immature specimens, the tail is almost naked, and the tips of the teeth with 
little or no color, even when of full size. 
This species is perhaps more nearly related to S. forsteri than to S. cooperi, although resem- 
bling the latter most in color. In size it occupies an intermediate position, as also in the pro- 
portional length of the tail. 
Its distribution I have not yet ascertained with precision, though it is known to range from 
eastern Massachusetts to Cleveland, Ohio, and as far north as Burlington, Vermont. 
Lust of specimens and measurements. 
Nose to— |Tail to end of— Length of— 
Current Locality. Sex. Ear. | Nature of | From whom re- 
number. specimen. ceived. 
Occip.| Tail. | Verteb. | Hairs.| Fore ft. | Hind ft. 
1691 Hingham, Mass.-|...-| 82 2.10 1.50 1. 65 25 45 25 In alcohol.| Dr. T. M. Brewer. 
1693 Middleboro, Mass.|..--| 85 2,15 1,46 1.65 25 47 25. |....dol.. 4/5. Wi Po denkgeee 
April & May. 
TRG, Wis aeflded dee ---|----| 85 | 2.04] 1.50 | 1.60] 25 eo 14198) 2 |. dees) eee den db nae 
1695 a= sO Ose eee see ----| 85 | 2.25] 1.40 | 1.50 25 46 250i nit domes 1 see doi ueo 
21696 | October -------- Sse leet a PATON alas 1. 85 25 46 Dbl a2 dosuucia== seer do---s2ee 
ABT kana soe 5e See Soares eS Pe eater Og |e rater 25 ca eee a4 Beer (eee (eee Be doi s<semen 
1698 | Spring ----.---- meee BO aatOn | ewe) ae oD 25 46 PTs PRR Ce ME fT J Ci (et 
1699} 3|24=-d02s-en—mee— 3d | 8 | 2.18) 1.46 | 1.55 25 46 25 *\03 dom S| eee cae ddlaenseee 
1700; jee adO mene mee ----| 85 | 2.00] 1.6) | 1.60 25 AGiRhs| ee S weSedoll.|:oe ae dose sos 
17004 2esedb tee aa cee sone | 90 a) Below 145i || S55 25 lnm fe! ae | ase dOkenat eee tre 5 Va 
? 1702 December -.--.-- ise) Ss | eHOO 1. 60 1. 80 25 AG) 3h ban 5) Bs dobbs = sa do. hat sae 
TABS lock res ----| 85 |218| 1.45 | 1.60] 25 ronan | Pepe Pega ate atees: dol jig 
ily) S| Reser bess 8 asen| COU | 215-1 1550) | 2562 25 BGisalltcccamtecee dots sides dons dé--s825-5 
Wi0o) |oeesd0e-nes eee meee OO) ye G0) I) Leto ll ebb 25 Abie | cepse ce eee Cine See Bee 0c oneeee 
1706 ui) o-2dOss area Sebel oO 2.10 1.50 1. 62 24 Eh pe Bd DOs avlnaec aes dO. 2 sacsem 
Oba col Mov. Uydk8aass.-| Voce 20 lee SAL. Lee al ee | ee ee Dry skin. -| gq ----do-------- 
1084 Det,. 12; 1865.23). Gye sses ee Oe aoe bet oe al, Sees ile Be eee Se Fe es eee re do. 2eeees 
955 | Oct. 29, 1855 ..-|..-.|...-.. [Estar ES Fea SOR [ag RP A) UU ad CR AS a douh ds anes dates 
1456) || Mar. 28, 18b6_ --)25- - |) 84) 2025 e160) SS: se lee ASS See a doe eA does ate 
814. WiGleveland 4Oni6. 12% Aap cee | toa ae ae ete aol pe eee oe eee eae Siege oe ee be) do..-.| Dr. Kirtland.---- 
ty, a] DAFIM PION Gene oosleoe nose een] ecccauleoeaee [Se See Ee ee do..--| Prof. Thompson -- 
