present in all Nebraskan specimens. Mice from the two localities in Knox County have buffy underparts; those from other Nebraskan localities do not. Of nine specimens of P. f. perniger examined from Elk River, Sherburne County, Minnesota, none has buffy underparts whereas a specimen from Randolph, Fremont County, Iowa (NSM) does. In addition, in two of five specimens of P. f. flavescens from Kelso, Hooker County, (MZ) the lateral line encroaches on the underparts. The encroachment of the lateral line on the underparts, or failure of the line to do so, is thought to be only an individual variation and of no taxonomic use.

Perognathus flavus piperi Goldman. Buffy Pocket Mouse.—In the description of P. f. bunkeri, Cockrum (1951:206) allocated to the new subspecies, without comment, a specimen from Alliance, Box Butte County. I have examined this specimen along with all other Nebraskan specimens known to me and, although all approach bunkeri in cranial measurements, they seem best referred to piperi on the basis of darker dorsal coloration and larger external measurements. Additional records of occurrence, several of them marginal to the eastward, are: 10 mi. S of Antioch, Garden County, 1 (MZ); Kelso, Hooker County, 4 (MZ); 5 mi. N of Bridgeport, Morrill County, 1 (MVZ); 6 mi. N of Mitchell, Scotts Bluff County, 1 (NSM). A specimen not seen by me that was reported from Valentine, Cherry County (Beed, 1936:21), is presumably also best referred to P. f. piperi.

No specimens of P. flavus are known to me from south of the Platte River in southwestern Nebraska although they probably occur there. If so, they may be referable to P. f. bunkeri, which is found in counties of Kansas adjoining the southwestern part of Nebraska.

Perognathus hispidus paradoxus Merriam. Hispid Pocket Mouse.—This subspecies occurs commonly in central-and western-Nebraska. Eastern marginal records of occurrence are: 2 mi. SE of Niobrara, Knox County, 1 (NGFPC); 4 mi. E, 2 mi. S of Ord, 1; Bladen, Webster County, 2 (HM).

Perognathus hispidus spilotus Merriam. Hispid Pocket Mouse.—Jones and Webb (1949:312) first reported this subspecies in Nebraska as from 5 mi. SE of Rulo, Richardson County. Additional records of occurrence are: 3 mi. SW of Barnston, Gage County, 1 (NGFPC); Bennet, 1 (NSM), 9 mi. NW of Lincoln, 1 (NSM), 1-1/2 mi. S of Lincoln, 1 (NSM), Lancaster County; Peru, Nemaha County, 1 (NGFPC); 3 mi. S, 2 mi. E of Nebraska City, Otoe County, 3; Barada, Richardson County, 1 (NSM); Pleasant Dale, Seward County, 1 (NSM); 1 mi. S of Williams, Thayer County, 1.

Glass (1947:179) referred a specimen from 9 mi. NW of Lincoln, Lancaster County, to P. h. paradoxus. In discussing the zone of intergradation between spilotus and paradoxus, geographically adjacent to the west, he wrote (op. cit.:178), "It is evident that it proceeds northeastwards, toward the Missouri River since 2 specimens from eastern Nebraska, a juvenile from Webster County and an adult from Lancaster County, are both typical paradoxus." I have examined the specimen from Webster County referred to by Glass and agree that it is paradoxus. I have not seen the specimen from 9 mi. NW of Lincoln; however, another specimen from there, two others from Lancaster County, and one from Seward County (see above), are here referred to P. h. spilotus, rather than P. h. paradoxus, on the basis of notably darker dorsal coloration and smaller external and cranial measurements. The range of P. h. spilotus in Nebraska, as presently known, therefore, is limited to the eastern, more humid part of the State, south of the Platte River.

Peromyscus maniculatus osgoodi Mearns. Deer Mouse.—Swenk