124 RODENTS OF IOWA 



in nests or burrows, but it is probable that the animal does not 

 use this food since it usually remains quiescent throughout the 

 cold season. 



While the Hudson Bay jumping mouse undoubtedly occurs 

 throughout the state, it seems to be more common in the prairie 

 regions. The few definite locality records which have been ob- 

 tained are as follows a mounted male specimen (No. 3931) in 

 the Museum of the State University of Iowa was collected at 

 Oskaloosa in 1889. The Coe College Museum possesses two mounted 

 specimens, one collected at Britt, August 20, 1911; the other 

 bears no data, although B. H. Bailey assured the writer that 

 it was collected "somewhere" in Iowa. A female specimen of this 

 species collected near Pomeroy was sent in to the University Taxi- 

 dermist's Laboratories, March 20, 1916. The animal had been 

 killed a few days previously. T. C. Stephens of Morningside Col- 

 lege reports three specimens of this form captured near the Iowa 

 Lakeside Laboratory in the summer of 1915. 



PRAIRIE JUMPING MOUSE. 



Zapus kudsonius campestris Preble. 



Zapus hudsonius campestris Preble, N. Amer. Fauna, No. 15, 

 20, 1899. 



Description, Summer: Color above similar to brightly col- 

 o'red specimens of the preceding form; dorsal area distinct, suf- 

 fused with ochraceous buff, the sides ochraceous buff ; under parts 

 and feet white; tail dark gray above, yellowish white below. 

 Fall: Sides yellowish; the dorsal area almost black, the hairs 

 tipped with yellowish; upper surface of tail darker than in sum- 

 mer, and ears darker and bordered with whitish. 



Measurements. Total length, 8.75 inches; tail vertebrae, 5.30 

 inches; hind foot, 1.10 inches. 



This form is very similar to the preceding, differing from, it 

 mainly in its slightly larger size, its brighter color, and higher 

 "brain case. The area of inter gradation of the two forms includes 

 the western part of Iowa, the present form being distributed from 

 Manitoba south over the Great Plains to Nebraska and west to 

 Colorado and Wyoming. The prairie jumping mouse is said to 

 replace the Hudson Bay jumping mouse over the northern and 

 more elevated portions of the plains west of Minnesota and Iowa 

 to the base of the Rocky Mountains. 



