veraging larger in most measurements of the
skull; significantly longer molar tooth-row; hind foot averaging
longer. For comparisons with the subspecies to the east and the
northwest see the accounts of those below.

_Remarks._--_M. p. uligocola_ is more closely restricted to wet
situations than _M. ochrogaster haydeni_ (Baird) whose general range
lies to the eastward. The numerous lakes, the continuous supply of
water from the mountains, and the irrigation systems at lower altitudes
along the eastern base of the mountains provide the conditions to which
_uligocola_ is suited. It is named for its predilection for water.

The variability in color is relatively greater in topotypes of both
_uligocola_ and of _modestus_ than in many of the other series studied.
Specimens from Denver and Colorado Springs taken in late autumn and
winter (October to February) are paler, more reddish and less blackish,
than specimens taken in June and July at Loveland. This reddishness
results from longer, and more intensely reddish tips of the hair. The
entire hairs also are longer. The average weight of 16 adults (12 males
and 4 non-pregnant females) from near Loveland is 49.7 gms. The average
length of the ear is 13.4.

_Specimens examined._--Total 228. _Colorado_: LARIMER CO.: 6 mi. W,
1/2 mi. S Loveland, 5200 ft., 18; 3 _mi. N Loveland_, 3;
_Loveland_, 4 (USBS). MORGAN CO.: 4 mi. W Orchard, 4 (Mich);
_Orchard_, 1 (Mich). BOULDER CO.: Boulder, 91 (USNM 19, UC 12, Chi
60 examined, additional specimens in the collection); _Valmont_, 4
(UC). CLEAR CREEK CO.: Clear Creek, N side of Idaho Springs, 1.
JEFFERSON CO.: Olivet, 10 (Denv). ADAMS CO.: Crook's Lake, 8
(Denv); Barr, 16 (Denv 15, ERW 1). ARAPAHOE CO.: Denver, 21 (USBS
3, AMNH 8, Denv 10). PARK CO.: William's Ranch, near Tarryall, 11
(Denv). TELLER CO.: Divide, 2 (ERW). EL PASO CO.: Colorado Springs,
31 (ERW 22, AMNH 7, MVZ 2); 12 mi. S Colorado Springs, 3 (MVZ).

Microtus pennsylvanicus finitus new subspecies

_Type._--Adult female, skin and skull, number 50204, University of
Kansas, Museum of Natural History, obtained by J. K. Jones, Jr.,
original number 906, 5 miles north and 2 miles west of Parks in
Dundy County, Nebraska, on August 16, 1952.

_Range._--The valley of the north fork of the Republican River in
eastern Colorado and southwestern Nebraska.

_Diagnosis._--Entire animal and skull lar