BIOLOGICAL PAPERS. 175 



32. Microtus austerus Le Conte. Prairie Vole. 



Abundant in eastern and central Kansas. Does much damage to fruit- 

 trees. 



33. Microtus nemoralie Bailey. Woodland Vole. 



Common in suitable localities in eastern Kansas. One taken by me at 

 Manhattan November 19, 1901. 



34. Microtus haydenii Baird. Hayden Vole. 



Common in western and northwestern Kansas. 



35. Synaptomys helaletes gossii Merr. Goss's False Lemming. 



Taken at Neosho Falls by Capt. B. F. Goes. Has been found at Topeka 

 by Charles Popenoe. 



36. Fiber zibtethicus Linn. Musk Rat, 



Common along streams over the whole state, unless the streams are shallow. 



Family Geomyid.e. Pocket-gophers. 



37. Geomys bursarius Shaw. Prairie Pocket-gopher. 



Abundant over the eastern half of the state, except in the southern coun- 

 ties outside the Arkansas valley. The most formidable rodent pest in 

 the state. 

 .38. Geomys lutescens Merr. Plains Pocket Gopher. 

 Abundant in sandy parts of western Kansas. 



39. Geomys breviceps Baird. 



While it is possible that the specimens referred to this species by Pro- 

 fessor Baird and taken at Fort Riley by Dr. A. W. Hammond were of 

 the preceding form, there are other specimens extant taken in southern 

 Kansas which, while not typical breviceps, may be referred to this 

 species. Further investigation will no doubt result in the finding of 

 typical specimens within the state. 



Cratogeomys castanops Baird will probably be found in the southwestern 

 corner of the state, as the type came from Las Animas, Colo. 



Family Heteromyid.e. Kangaroo Rats, Pocket Mice. 



40. Perodipus richardsoni Allen. Richardson's Kangaroo Rat. 



Well distributed in the state, especially in the western part, but most 

 abundant in the sand-hills of the southwest. Perodipus ordii Woodh., 

 on Baker's and Knox's lists, probably does not occur in the state. 



41. Perognathus flavescens Merr. Plains Pocket Mouse. 



Found in north-central part of the state. 



42. Perognathus hispidus paradoxus Merr. Kansas Pocket Mouse. 



Abundant. Type from Trego county. Specimens from the extreme south- 

 ern part of the state are brighter in color and smaller than those from 

 farther north, and may approach typical hispidus. 



Perognathus flavus Baird may occur in northwestern Kansas, but no 

 specimens are known to me. On Knox's list. 



Family Zapodid.e. Jumping Mice. 



43. Zapus hudsonius campestris Preble. Prairie Jumping Mouse. 



Not common. I have seen a few specimens in the state. 



