_Comparisons._--From topotypes of _P. f. flavus_ from El Paso, El Paso County, Texas, _P. f. bunkeri_ differs as follows: Averaging larger in all cranial measurements taken except in occipitonasal length, which is approximately the same, and in interparietal width, which is less; color more buffy, with fewer black hairs dorsally. From topotypes of _P. f. piperi_ from 23 miles southwest of Newcastle, Weston County, Wyoming, _P. f. bunkeri_ differs as follows: Smaller in frontonasal length, mastoidal breadth, and length of auditory bulla; color more buffy, with fewer black hairs dorsally. From topotypes of _P. f. sanluisi_ from nine miles east of Center, Alamosa County, Colorado, _P. f. bunkeri_ differs as follows: Averaging larger in all cranial measurements taken except interparietal width, which is smaller; color lighter and more buffy. _Remarks._--This is a brightly colored subspecies of _Perognathus flavus_, with less black dorsally than any adjacent one. The lateral line is well marked. Three young adult specimens taken from Wakeeney, Trego County, Kansas, are much brighter than other specimens from Kansas. The five specimens from Greeley, Weld County, Colorado, are much darker dorsally, like _P. f. piperi_, but are referable to _P. f. bunkeri_ on the basis of cranial characters. The name _P. f. bunkeri_ is proposed in recognization of the continued attention which the late Charles Dean Bunker, Curator of Birds and Mammals of the University of Kansas Museum of Natural History, gave to building up the collection of mammals from Kansas. Acknowledgment is made of the assistance afforded me by a Research Assistantship with the Kansas Biological Survey. _Measurements._--Measurements of holotype and average of four adults (two males and two females) from the type locality are as follows: total length, 104, 105.2; length of tail, 44, 47.5; length of hind foot, 16, 16.7; length of ear, 7, 7.2; occipitonasal length, 20.6, 20.9; frontonasal length, 14.0, 13.9; mastoidal breadth, 12.1, 12.0; length of bulla, 8.0, 7.8; interorbital breadth, 4.5, 4.6; alveolar length of upper molariform tooth-row, 3.3, 3.1; interparietal width, 3.2, 3.2. All of the measurements listed above are available for each of the five specimens except that the occipitonasal length and frontonasal length are not available for the two males. _Specimens examined._--Total, 54, distributed by localities of capture as shown below. Those from Nebraska and Colorado are in the US Nat'l Mus., Biol. Surv. Coll., and those from Kansas are in the Univ. Kansas Mus. Nat. Hist. NEBRASKA:--_Box Butte Co._: Alliance, 1. COLORADO:--_Weld Co._: Greeley, 5. _Kit Carson Co._: Burlington, 1. _Fremont Co._: Canon City, 1.