Seemingly the recessive gene for red is still present in _lordi_, or has mutated anew. When present, the color is deeper and brighter than in the parent population, in keeping with the heavier pigmentation of the race _lordi_. =Perognathus parvus lordi= (Gray) _Abromys lordi_ Gray, Proc. Zoöl. Soc. London, p. 202, 1868. _Perognathus lordi_ Merriam, N. Amer. Fauna, 1:28, October 25, 1889. _Perognathus lordi lordi_ Miller, U. S. Nat. Mus. Bull., 128:279, April 29, 1924. _Perognathus parvus lordi_ Davis, Recent Mamm. of Idaho, p. 266, Caxton Printers, Caldwell, Idaho, April 5, 1939. _Type._--Obtained in southern British Columbia (probably near Lake Osoyoos) by J. K. Lord, probably in 1860. _Racial characters._--Size large; color of upper parts buffy-olive, washed with blackish; sides buff-olive; facial markings absent or, if present, indistinct and pale olive; tail blackish above, olive below. _Measurements._--Twenty-nine males and 10 females average, respectively: total length 175, 171; length of tail 93, 89; hind foot 23.4, 22.9; ear 5.3, 5.1. _Distribution._--Okanogan Valley and the Columbian Plateau, except for the southwestern part. Marginal localities are: Vantage, Grant County (W. W. D.), 10 mi. S. Moses Lake (W. W. D.), Washtucna (M. V. Z.) and Pullman (M. V. Z.). _Remarks._--There are constant differences between _Perognathus parvus parvus_ and _Perognathus parvus lordi_. The latter is larger, darker, and differs slightly in average cranial measurements. The Snake River, the Columbia River, and the Wenatchee Mountains separate the geographic ranges of the two subspecies and prevent intergradation between them. Nevertheless their close similarity and probable common origin indicate that both belong to one species, namely _parvus_. =Perognathus parvus columbianus= Merriam _Perognathus columbianus_ Merriam, Proc. Acad. Nat. Sci. Philadelphia, p. 263, September 27, 1894. _Perognathus lordi columbianus_, Osgood, N. Amer. Fauna, 18:40, September 20, 1900. _Type._--Obtained at Pasco, Franklin County, Washington, by Clark P. Streator on May 9, 1891; type in United States National Museum. _Racial characters._--Size and color as in _lordi_ but skull considerably wider in mastoid region. _Measurements._--Twenty-one male and 9 female topotypes average, respectively: total length 173, 168; length of tail 91, 89; hind foot 23.9, 22.8; ear 5, 5. _Distribution._--The vicinity of the type locality and the part of the Columbian Plateau north of the Snake and east of the Columbia rivers.