Through the courtesy of Miss Viola S. Schantz I have examined three of the four specimens from Cairo, Kansas, that Osgood (N. Amer. Fauna, 18:21, September 20, 1900) referred to _Perognathus flavescens_ before any subspecies of that species had been recognized. The specimens from Cairo are intermediate in color, as they are also in geographic position, between _P. f. flavescens_ from western Kansas and _P. f. cockrumi_ from south-central Kansas but show more resemblance to the latter and therefore are referred to _P. f. cockrumi_. The specimens, excepting the three from Cairo, are in the Museum of Natural History at the University of Kansas. _Specimens examined._--Total, 10 distributed as follows: _=Kansas:=_ ELLSWORTH CO.: 1-1/2 mi. S Wilson, 1. PRATT CO.: Cairo, 3 (U.S. B.S.). BARBER CO.: Plum Thicket Farm [= 1 mi. E and 3 mi. N Sharon], 4. HARPER CO.: 4-1/2 mi. N Danville, 1. _=Oklahoma:=_ DEWEY CO.: 6 mi. W and 1/2 mi. S Canton, 1. _Transmitted August 23, 1954._ 25-5678 * * * * * Transcriber's Notes: Bold text is shown within =equal signs=. Italic text is shown within _underscores_.