the White-footed Mouse was the common house Mouse (1886). Brown's Ve 
1887: Common. 
_ scattered around their holes. sie 
' merous on the east side of Lake Traverse. 
Dakota.—F ort Sisseton, June, 1887: Common. Grand Forks, July. 1887: Commo 3 
Pembina, July and August, 1887: Common, Devil's Lake, Ramsey County, August, 
Woop Rat; BrusH Rat (Neotoma cinerea). edad s 
Dakota.—Black Hills, October and November, 1887: Common among the rocks, 
high up. They live in caves, cracks, and holes under the rocks. Their principal _ 
food seems to be the seeds from the pine cones. Large piles of gnawed cones are. 
WHITE-FOOTED MOUSE (Hesperomys leucopus). 
Minnesota.—Ek River, Sherburne County, 1887: Numerous everywhere. sii 
WESTERN WHITE-FOOTED MOUSE (Hesperomys leucopus sonoriensis). 
fc 
Minnesota.—Brown’'s Valley, Traverse County, June 21 to July 8, 1887: Mostnu- . ; 
: STG 
2 ieee 
Dakota,.—Pembina, July 21 to August 2, 1887: Common, and with one exception 4 
S 
found only in the woods. Devil’s Lake, Ramsey County, August 6 to 19, 1887; ae 
Common in woods and brush. Bottineau (on western edge of Turtle Mountain), © ‘A 
August 22 to 30, 1887: Numerous in the brush. Fort Buford, September 1 to 20, 9 
1887: Abundant in all brush, and common on prairie and hills. Evidently feedsex- i 
tensively on the seed of cactus (Opuntia missouriensis) and the seed of wild sun= | “a 
flower (Helianthus rigidus). Deadwood, in Black Hills, October 24 to 31, 1887: aad 
Common on the tops of the highest hills. Fort Sisseton, Marshall County, Jume15 = 
to 18, 1887: Apparently scarce; probably because of the abundance of Badgers. 
Rapid City (on eastern edge of Black Hills), November 16, 1887: Quitecommonamong 
the rocks on the hills and around fields on the prairie. The color of the adults is 
paler than any seen before. ne 
Montana.—Tilyou’s Ranch, Dawson County, September 23 to October 6, 1887: 
Common in brash and on hills. a, 
MIcHIGAN Mousa Hesperomys michiganensis). 
Minnesota.—Brown’s Valley, Traverse County, June 21 to July 8,1887:Common ~~ 
on the high prairie in the town of Traverse, on the Dakota side of the valley. Found © 
them in the same holes with the Grasshopper Mouse (Onychomys leucogaster)in the 
Indian mounds. ; wee, 
Dakota.—Harwood, Cass County, July 14, 1887: Numerous all through the fields 
and meadows ; cuts down much wheat and other grain. Flandreau, Moody County, . ._ 
May 25 to 31, 1887: Found on ground a little higher than that inhabited by the . 
Meadow Mice (Arvicola riparius). Caught one on top of a high hill. Pembina, 
July 21 to August 2, 1887: This Hesperomys, which is common on the praities here, — 
. 
ee 
seems to be about the only Mouse of economic importance. It livesnear the grain fields, a 
and cuts down a small quantity near theedges. It cutssome grasses on dry ground “es 
for the seed, but is not numerous enough to be of great importance. I think it 
eats the seed of pennycress(Thlaspi arvense) which has become so thick that nm. 
some fields nothing else can grow. Some fields are abandoned to it, and it is more eae 
or less in all of them. While this species inhabits the prairies and open ground, : 
the White-footed Mouse lives in the woods. Bottineau (on western edge of Turtle ~ 
Mountain), August 22 to 30,1887: Caught one under a wheat shock on the prairié ~~ 
that I believe is this species. It is very different from from the H. leucopus found —™ 
here in the brush, the principal difference being in the darker gray color, slenderer ee, 
build, and much slenderer tail. Shi: 
| " R , 
GRASSHOPPER MousE (Onychomys leucogaster). ~ i 
Minnesota.—Brown’s Valley, Traverse County, June and July, 1887: Numerous 
on the flats near town and common on the high prairies west of the valley; not_ , 
found on the east side. They live in holes on the top of Indian mounds, in sides of 1% 
banks, and in holes under débris among brush. They seem fond of cheeseand fried i 
cakes, but of their other food J learned only by dissection. They begin moving 
