476 U. 8S. P. R. R, EXP. AND SURVEYS—ZOOLOGY—GENERAL REPORT. 
List of specimens. 
= | Measurements. 
. e | ~ _—— = = ci 
o = one on eee 
2 4 | le) glelele 
E ee! . , 2 | JF /ealeo/sle 5 
ES} Sie Locality. When col- | Whence and how | Nature of AS = a ecaal Ses tee ~ | & | Collected by— 
3 a Sp lected. obtained. specimen. | >| 3/8/38) 2/3 | S e\s oe 
lal z efels)|e] 2 | sie cals poole 
= o | a olole|a |2)3 | m/e] Sle 
= = * fa | er ee] en |g | eee Ae tee eee 
co o 2 S i) So i) o a|o o oe o 
LS) 16) R 2\/4/2/4/8 |eixal/al{als 
204 | 1175 |....0. St. Mary’s, R. Mts..,.} Oct. 1, 1853) Gov. I. I. Stevens...) SKin.....4.)-+00)eee+) eee |.nas| coee|-wns|sesc|oveel enacts nal DInGuNaeklams 
eeeees| Milk river,Neb......| AUg.21,°53|........d0......++++| In alcohol .|....|.«.-|. shen) ser|eceeloeesleees|eeee|enee cocseedQcavees 
fdo:. fuse seeee.| Aug., 1855) Dr. F. V. Hayden..|....do......| .57/1-00)1.153.282.70)....) .35) .79)s+4.) 000.) seeee 
BECO: ney ces esee| -osd0seara:| -59|1.10)1.173.402.60)....| .35) .80). sae 
Osc ser ee hi eses dase : -50| .93/1.133.052.16]....| .35] .65).... Brbscattboote 
-58) 91 1.173 00'2.50}....| .40) .85).. Dr.F.V.Hayden 
-52| -90|L-13/3:00}9519})....|.00.] .80). <5) -cnelessapekiiuenaan 
47] .80) .92}2.302.03}....)..0.] .65]...-|eeee|sccceeOvccees 
50} .95)/1.15)3,18.2.93)....] 138) 75] .. -|evee|sesseeAOsoevee 
-59)! 00/1. 17)3.12:2.40]....| 40) 84) ...}0000| -oseeedOucencs 
+50) .95/1.15}3.10.2.46)....| 40) .74)..0.]..0.]eeceeeDO.oeees 
QSAT | .eceesloce mie'ni| sure =tsiste Ors ctepia rire aw sorxeUOniee oil's 
eeeeee 
aeeeeeeens +50) .90)1.05/2. 75/225}... .BO) «78).000)-.-eleeceesAOrcsces 
Sac neoed 50 -80/1.07)2.65 2.00)... -A0) .77|.. aneecl® cuncu 
-55/1.00/1.163 002.50}... .45] . 
-53]1.00)1.13'3.00)2.40)....] .40) . 
-51) .90/1,15}2.66)2.58)....| .37] . 
seccesDOevceee 
s0ceesdOvscene 
ewelvetee sees secslenac{accs|ucce|coee|sccslecesoves|ogsconUOvraens 
ilaleiareie! Sanne ce al herr) acd eee) Bacal Bead parc! Foor Je auliteg ao cnecflOxceses 
Aug. 6,°56 dase] sciss{x0v} eae s{'e cine Bee seid teed esos oc! ime ln sas 
Aug.16, 756 Panes | sen vecslecce|ssccleous|ecce|ecseesQnecsce 
«| July 28, °56 A sae (seis secsleaceleces|eoee|scee|eeesesdQscceee 
Aug.16,756 |........ woes U0 pecan 
obs AO reece 
See COneerey 
deuv el Ownaaae 
ghan...|.... 
sees|eeneecdOseeces 
TLR Bsc | (Ge | Esee asact bnssedtineooae [seston coveen| yaaa GOs. veediacon|anusascareas)| sees |asmni ls QO snee|seeeee€Oseeece 
1927 |....--|..+--.| North Platte river....| Aug.21,°56| Lt. F. T. Bryan....| In alcohol.| .45 .73)}1.00)2.40\....|..0. +35] .73)..06/e06-| W.S. Wood. 
DORB iH ccccn stab cis site Medicine Bow river..| Aug. 7,756 |........O..e..eeeee|.+++GOe. eee) $50) .87/1.09/2.60:2 20)....| 135) .73)...-).00.| secre AO. evens 
1932 |......| ...-.| Engelmann Creek of | Oct. 13,56 |......6.dO..eseseeee[eeeGOseeeee| +45] 75) .95/2.19]1 G5)... .)0000| .70}saceleoes|eeveesAOseeeee 
| Rep Fork. 
Used Rosary Coro ROSer rrr. Ue nase mericey Meee cy 
144 | 1196 |......) Santa Cruz, Sonora.. 
SSG NEES Soesien|| (eeeie'sa Oss cece eeeees 
UES R Span) Coicocren Usp aaa. acsonl loacae 
ve 6) |s06s cee >| nena LcO4l sci funs sa eOmemen 
5 .| J. H. Clark.. 
++++|3,25 1,932.00 228) 275). cowl eos] ceuesOnaaeue 
seine cee eAOre cccececclces AO. cave falc |lnsivia| wiswe| wees 
Col. J. D. Graham. 
nis sell dois anole (Os s\0cidis\wnas fese’e 
ceeeleceeleeweleeee|enee|seeeleeeeeedOrevees 
9 A209) sees cal  Panoetlex.s/.ceecel scstantensne ameweneedO.tuceer act soos eens Per) Rl | a FB a | el 
542 |.. 2.:|-.-e0s] Fort Thorn,N.'M...:|.-..ceesec|| DroT./O. Henry...2| ‘Skin'......| 50} /...|0...13.75)2 25].222|) 39) 75] -coa}) GD ceeaemeeeaaene 
BAB "| snes: |b 2 ee0s|lennniseosUOssnscainveania|eecessneseas|sovelecesG0)s avenieeus|eserQOrcecesleees|cnsa|eens{.0}2.2Mlenee]se0]//0 26) nasi ance enc atae cane 
BAN Fo aes | asecae| ce entensed0ssvevs,ce cs vel Coeeten Sears | aeenecesdOrsuasascce| FecedQeuacesfecas| saus| wes sfSUBUD O5]-celesocl emilee | <0 ae 
SAS | vecsesloovecs|voseseesdQsece 
sees 
eee [de27) 21D). ...) e000! 80) .000)e 
HESPEROMYS MICHIGANENSIS. 
Prairie Mouse. 
Mus michiganensis, Aup. & Bacu. J. A. N. Se. Phil. VIII, 1, 1842, 304.—Is. N. Am. Quad. III, 1854, 326. 
Hesperomys michiganensis, Wacner, Wiegmann’s Archiv, 1843, mu, 51. 
? Mus bairdii, Hoy & Kennicorr, Agricultural Report U.S. Patent Office for 1856, (1857,) 92; pl. xi. 
Sp. Cu.—Smaller than H, leucopus; ears and feet much smaller and shorter. Above, blackish brown; crown of the head 
almost black; sides of the adult with an intermixture of grayish yellow brown; a district dorsal wash of darker; beneath» 
snowy white. Upper surface of fore and hind feet dusky to the base of the toes. Tail white beneath. Maximum length of 
head and body, usually 3.00; tail one inch to half an inch shorter; hind foot seldom exceeding 0.70; never 0.75. 
