548 
hence over 50 per cent. of the bulk of the food was probably the 
fruit of that plant. Many similar illustrations could be given. 
Kennicott says that white-footed prairie-mice injure young 
fruit-trees by gnawing at the roots. It is possible that when young 
trees are set out on the prairie this might happen, though even then 
I should be inclined to suspect that a meadow-mouse was the cul- 
prit till it was proven otherwise. In any case this species does not 
seek nurseries, small-fruit patches, etc. Even in a cemetery in 
which they were very abundant in open places, I have never taken 
them in the neighborhood of shrubbery. | 
An examination of 24 females made to determine time of breed- 
ing, number in litter, etc., gave the following result. 
Date | pee ae Condition of female. 
ey VOM ae. 38349 Uterus small, empty. 
eb yA OM ies a. 37858 With 2 young, 81 mm. long. 
12s) OR he crepe 37110 | Pregnant; 4 small embryos. 
Wiaie 26 8 | 31900 Nursing. 
(onan eee 38359 Five embryos. 
Bie. 50h. s| ho o008 Uterus small, empty. 
(OC Us see 39606 | Uterus empty but swollen. 
Ochiai «3% | 39607 | Six embryos, 2 mm. long. 
OCR 7 OG c. 38228 Uterus small, empty. 
Oer2Gs..-.8 | 38230. | Uterus small, empty. 
Oct s0s | 38236 | Nine embryos. 
OchwsO-e.- 4) os259 Uterus empty, mamme large. 
Oot OR mae 38240 | Seven embryos, half grown. 
Oct Sie™. jas 38246 | Seven embryos, a fourth grown. 
Oo sl ke | 38249 | Six embryos, nearly grown. 
INOW. ia 39635 Five embryos, nearly grown. 
NOMS. "Si xiao 39638 Uterus empty but swollen. 
NON sO ee: | 3.52169 Uterus small, emoty. 
INOwenel OP 38270 Four embryos, very small. 
Nowe Ieee 38286 Uterus empty. 
Now. 20-32 | 39652 | Uterus empty. 
NoweZ0Gn a. 39654 | Uterus empty. 
Now SOR er 38295 Uterus small, empty. 
Now so OF esa: 38296 Uterus small, empty. 
