444 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.47. 



10.1 (9.8-10.3) ; length of mandible, 14.5 (14.2-14.9) ; maxiUary tooth 

 row, 4.1 (4.0-4.4). For detailed measm-ements of specimens see page 

 476. 



Type-specimen. — No. 33544, American Museum of Natural His- 

 tory, New York. Skin and skull of young adult female (teeth little 

 worn), still in immature pelage. Collected August 20, 1912, by 

 H. E. Anthony. Original number, 121. 



Remarks. — ^This is a subspecies closely related to 0. I. hrevicaudus, 

 and differing only in color. It intergrades with hrevicaudus in the 

 western Snake River Valley and aU along the adjoining ranges of 

 the forms. Tlie palest specimens I have referred to fuscogriseus come 

 from the northern Plains of the Columbia. Some of these skins are 

 nearly as light colored as true hrevicaudus. 



Specimens examined. — Total number, 78, from the following locali- 

 ties: 



Washington. Asotin, 1; Baird, 3; Coulee City, 7; Douglas, 2; 

 Mabton, 4; Pasco, 4; Rattlesnake HiUs, 1; Touchet, 2. 



Oregon : Alvord Valley, 1 ; Buck Creek, 1 ; Goose Lake VaUey, 

 1; Harney, 2; Heppner, 2; Ironside, 10 (type and paratypflt, Amer. 

 Mus.); Klamath Basin, 2; Klamath Falls, 3; Narrows, 2; Plush, 2; 

 Swan Lake VaUey, 2 ; Tule Lake, 1 ; Umatilla, 5 ; Willows Junction, 1 . 



Idaho: Nampa, 2; Weiser, 1. 



California: Dry Creek, Warner Mountains, 9 (Univ. of Calif.); 

 Madeline Plains, 3 ; Picard, 1 ; Sugar HiU, Modoc County, 2 (Univ. 

 of Calif .); Tule Lake, 1. 



ONYCHOMYS LETTCOGASTER MELANOPHRYS Merrlam. 



1889. Onychomys leucogaster melariophrys Merriam, Nortli Amer. Fauna, No. 2, 

 p. 2. October 30. 



1890. O[nychomys] mdanophrys pallescens Merriam, North Amer. Fauna, No. 3, 

 p. GO. September 11. (Moki Pueblos, Navajo County, Arizona; type in 

 U. S. National Museum.) 



1890. Onychomys melanophrys pallescens Merriam, North Amer. Fauna, No. 3, 



p. 61. September 11. 

 1890. O[nycho77iijs] melanophrys Merriam, North Amer. Fauna, No. 3, p. 61. 



September 11. 



1895. Onychomys leucogaster pallescens Allen, Bull. Amer. Mus. Nat. Hist., 

 vol. 7, p. 225. June 29. 



1896. Onychomys pallescens Mearns, Proc. IT. S. Nat. Mus., vol. 18, No. 1081. 

 Advance sheet, p. 4. May 25. 



1901. Onychomys melanophrys Miller and Rehn, Proc. Boston Soc. Nat. Hist., 



vol 30, p. 67. December 27. 

 1912. Onychomys melanophrys melanophrys Miller, Bull. 79, U. S. Nat. Mus , 



p. 127. December 31. 



Type-locality . — Kanab, Kane County, Utah. 



Geographic distribution. — South central and southeastern Utah, 

 southwestern Colorado, northeastern Arizona, and northwestern 

 New Mexico. North in the Grand River Valley to Fruita, Colorado, 



