82 MONOGRAPHS OF NORTH AMERICAN RODENTIA. 
Taste XIX.—Measurements of eighty-one (and list of other) specimens of supposed HESPEROMYS LEUCOPUS 
SONORIENSIS from the Middle Region, United States—Continued. 
c Nose of— Ewe | 
5S = 
i Locality. Collector. 3 3/8 Remarks. 
3 F uo sel aS [reall | 
3 S/S/S/S)5/e/5)2] 8 
‘Gi alalolaltlalalelea 
48) H. D. Schmidt --.---- --- |--- Bre | ese! eee -| -- | Alcoholic; young. | 
10122 Se4|rec 2. 80/2. 10;2. 30}. ...]....]....] Alcoholic. 
10123 Ee 3. 00/2. 65/2. 75]. 2]... Pallas dha 
2558 | Upper Missouri.....--.----- wn. |--- [----|--=-|----]----]-=--]----]---.].-. | Alcoholic; young. 
1927 | North Platte River ...-..--. W.S. Wood. ......-- 0, 45/0. 73)1. 00 2. 40 .-. |0.35)0. 72}... | Alcoholic. 
1928 | Medicine Bow Miver.-.-.--.-- . 6 --- |0.35}0, 73)... |..--do. 
1932 | Republican River ..-...--..-. 19 = eoce| Seo leae fils 
1933 Bed bose Pese lesee ss 
3093 4 ---10. 70).-- | Dry. 
3149 - 0.75 do. 
3134 =» |---|---«]---.| Dry; young. 
3138 -. |---.]0.80]-.-.| Dry. 
10419 --.|0. 71). 
3053 | Republican River ----|.-- |0.83)....| Dry; leucopus. 
— 3052 | Pole Creek.--.....---..-.-.. Bear Peee kas .--.|--- [0.72]... | Dry; stretched. 
3920 | Fort Randall. J.P. McCown...--- ---|--- |... |3.50/2, 75].-..|.---|0. 86}..-.| Dry; leucopus. 
6985 | Fort Lyons, Colo...---.----. Ie. Palmer. -...------ 69 | eed ksedeced|i saclloree sca WbEM eos) Ihe 
9331 | Nevada R. Ridgway. .-....-- Sco) baed bese soa2|bose boad|ias |asak ssc |JOIN 7s Voltas 
9737 | Wyoming... H. D. Schmidt ..---- ----|--- [3,102.90]... |.--./0. 71|.--.| Dry; leucopus. 
9734 See eran Se LOQ do] aee| el Os fo) eer ees Os 
9739 ~-.|----|3. 10)2. 10). 5_.|.--.10. 78]. .--| Dry. 
9733 oe) se IKRGWP ERI )hee Sere Sf a5 -COS 
7491 -- |--- |----|.---|--- | --.|----| Alcoholic; very young. 
10116 25 oan sce) tect hesd|isec| nea |Sacq]= oc Gs 
7449 0. 82)1. OF). vues 20) .. |.---|0. 75].--.| Alcoholic. 
7462 ----| =--|3.00.2. 10].._.].--.|0. 76).--.] Alcoholic; leucopus? 
7461 0,95]... |3. 40/2. 60}2. 75)0. 39)0, 80/0. 58... do. | 
10117 ). 95)1. 20°3. 10) 2. 70)2, 20/0. 40)0. 80)0. 59)... do. 
7481 ----| == |---+]---2] »- |---.|----| Alcoholic; ungrown, 
10119 a5 c ere eta eta | rere ee es 
10120 Seclse4losccl coc Boadlooacleecol4e="remc(uoe 
10121 = -- |---.| --.|----]0. 7]... | Aleoholic. 
T7164 2, 25/2. 40/0. 34)0. 80/0. 52) .. do. 
7475 =a ese oor all eee Boe e feet) oo aus Os 
4836 |...-.. GW) cohacteccsoaadcsnneso| peanod GWineressectote: 0. 55/0. 95,1. 15 3. 40 2. 60}2. 90/0. 31/0. €0)0. Ge)... .do. 
10246 
UD) paleeeee GI) -cepaapeasccsacondeind| be Soon GW Sescna=n G52 me esrerd | seal | seca | =e see | eee se | fret | ee 
10261 
9896 | Fort Shaw, Mont.-........... RAB Seitz eee Saas [eae =] 0100/2050) 2570/25 aos een OOS 
10302 
UD Pleccaes (oso sa6 auscacascogctadlacsoos GO nesses snes Beet ears hak -| Meee cood| Mosc ees freee bose bans 
10310) 
7471 (3300) 28'70|, o=21| sne | een aad Os 
10311 oo | eoce|eca|bses bac eontith 
10312 Pesta | see | eget [emda | estes | Seana | ees tea | ene OO 
10313 Sb oee | Pest} ae) or ees [zo |faco-|| Ae |e omc 
9869 | Santa Fé, N. Mex .......--- Unknown.......... Fe llig wales oe33 25/2850 oll bee eee | een Meee tos 
7489 | Fort Benton ............--.- Lieutenant inline | Fae he |S |ee nl |) see ||| sein eed Oe 
} 
t Drexler’s extensive gatherings of mice, both from the Platte region and from Fort Bridger, are all essentially of the 
sonoriensis style. Those from the Platte, like Hayden’s Nebraska and Upper Missouri Jots, are very pale and short-tailed, while 
the Utah ones are rather more like leucopus in color, and the brevity of the tail is not quite so strongly marked. In both 
these series the specimens grade directly into leucopus. We have, however, labeled them all ‘‘var. sonoriensis”’, because the 
attempt to discriminate has proved utterly impossible in this as in other similar cases where we have been oblized to label 
geographically, so to speak. This gradation into ordinary leucopus is in strict accordance with, and amply confirms, our 
mature opinion respecting the ‘‘ variety” sonoriensis. 
{ Colonel Simpson’s examples, from Fort Bridger, are pure sonoriensis ; so are Dr. Hitz’s, from Fort Shaw. 
