92 MONOGRAPHS OF NORTH AMERICAN RODENTIA. 
The absolute size and relative proportions of this species will be illus- 
trated by the following table of measurements, and require no further remark. 
TABLE XXV.— Veasurements of twelve specimens of HESPEROMYS AUREOLUS. 
Nose te— 
. = mS 43 4 Remarks and na- 
5 Locality. Collector. $ 5 s a) ture of speci- 
= z 5 2 es ee us ° S r men. 
5 # Be a 3 ‘a 3 5 & 2 
J 4 a) > ~ i-} a 
Alan A | lo) q = i B =) 
Schuylkill River, Pa ..| J. H. Richard .-.|.----.|------].----- 3.13 | 2.93 |...... 0.74 | 0.55 | Dry; doubtful. 
.| Society Hill, S. C.----. M. A. Curtis .-..|.----.]-----.|----- 3.30 | 2.75 |.-._.. 0.73 | 0.57 | Dry. 
ta[izoces Gt) saoseececcoges BEA eee aaa ese ees oases seoces | ten ons] ee bacel Ae Sele eee asst}, 
Charleston, S. C..-.---- J. Morrow Cae a 0.74 | 0.54 |....do. 
wean (be) so=o5ces doesO® csstsessc= 2.50 |......| 0.70 | 0.52 |.---do. 
--| Georgia. .-.- .--| Dr. Gesner.-... | 0.50 | 1.00 | 1.20 | 3.50 ].-..-. 0.38 | 0.70 | 0.57 | Alcoholic. 
.| Whitfield County, Ga | A. Gerhardt... - 2.50 | 0.33 | 0.68 | 0.55 |....do. - 
.| Georgia?.-..-...-..-- J. LeConte ----- 290) (eae 05070) | Seen Dry. 
fz, ....| Kemper County, Miss-| D.C. Llosd----- PACU Nie ssh ord thy ee els 
J.B. Mitchell . - ONTO ane ee Ona) |Penoce S2e00: 
2200 ecaseasee 2.90 0.40 | 0.75 | 0.63 | Alcoholic. 
R. Kennicott. - - 2.30 |...... OD |l---S5- Dry. 
\itca6| Q | Saint Louis, Mo....... G. Engelmann ..|....-. See a el|ee nein |e IO) | enol eens oxzoll ease Beeadoe 
| 
Tet Ecce beoe = (Win eoase=ee ease (Resse etl eceas Pe sesca tee meal lhina= | | .-do. 
AGL see) | seein GW esehosssceiaas CY oss ose Ilessecl|ssodcel|ssoevel lego cdlesceins Boer Alc.; very young 
and doubtful, 
TOOTAN Renee | eaeae Ql) -ssessseoses60 CORE R ERR ped Masee scaascilbobooa| |b sseanc ceetcolseesée||SceSaelleoase.s Seendo:, 
We are unable to appreciate any differences whatever in the series of 
skulls of this species as compared with a large number of those of leucopus. 
This elegant species may usually be distinguished at a glance from deu- 
copus by the peculiar and beautiful tint of the fur—a rich golden-cinnamon, a 
little darker from admixture of blackish hairs along the back; the ears like 
the general color, this extending on the fore legs to the paws, and a faint wash 
of the same tinting the under parts, between which and the upper parts the 
line of demarkation is usually obscure, and often, as in No, 1580, from Knox- 
ville, Tenn., inappreciable. The brighest-colored samples of deucopus we have 
seen invariably lean to chestnut-fulvous, instead of the peculiar orange-fulvous 
of aureolus. ‘Vhe difference in the shade is hard to express in words, but it 
catches the eye at once. These brighter ewcopus, moreover, have the ears 
dusky and the under parts snow-white, while in qureolus the orange tinges 
both these in a perceptible degree. The tail is but little paler below than 
above, with rarely, if ever, a line of demarkafion. 
While there is no question of the positive difference of this species from 
leucopus, even the small series before us shows considerable variation. In No. 
